The latest update to the?2017 ESPN 300 features significant changes in current rankings and a few key additions. Spring and summer camps and combines have changed opinions on some players. The football season is right around the bend, and senior campaigns will further determine the final rankings.Below are some highlights of the major changes:Biggest skill position moversQB Hunter Johnson (Brownsburg, Indiana) ESPN 300: 19 Clemson commit Johnson takes over the No. 1 QB spot for the pocket-passers. Simply put, he is just more advanced. However, he is not tapped out, which is exciting. He is polished, he can control the ball, and he is athletic. As a passer, he has many Josh Rosen-like qualities.WR Jeff Thomas (East St. Louis, Illinois) ESPN 300: 96 Thomas has really come around after some academic and off-field issues that put his senior season in jeopardy. After a strong spring and summer showing, both on the field and in the classroom, Thomas is ranked where his on-field ability warrants.QB Tua Tagovailoa (Honolulu/Saint Louis School) ESPN 300: 55 Alabama commit Of all the athletic, dual-threat QBs, Tagovailoa is the best passer of the group, especially when it comes to accuracy and timing. Although he does not possess ideal measurables, he compensates in so many other ways and has a great feel for the position. For these reasons, he takes over the No. 1 dual-threat QB spot heading into the fall.WR Trevon Grimes (Fort Lauderdale, Florida/St. Thomas Aquinas) ESPN 300: 27 To appreciate Grimes is to see him move and change directions in comparison to other players at the position who are nowhere near as big as he is. He is a load as a route runner and jump-ball player and is imposing with the ball in his hands after the catch. Even at 6-foot-4, 202 pounds, he moves like a small receiver.RB Toneil Carter (Houston/Langham Creek) ESPN 300: 94 Georgia commit Carter was able to put on a show in the passing game at The Opening this summer. He has return game capabilities that makes him a three-way threat out of the backfield and in the kicking game. At 5-foot-11, 198, he might not have ideal stature, but he can scoot and is dangerous in space and at the second level as a running back.Big men make big gainsOT Foster Sarell (Graham, Washington/Graham-Kapowsin) ESPN 300: 12 An already strong offensive tackle class is managing to look even stronger as the evaluation process continues. Five OTs now rank among the top 15 prospects, with Sarell jumping more than a dozen spots in the updated ESPN 300. The four-star possesses excellent size with a big frame to continue to develop and is demonstrating the tools to be an outstanding college tackle. With his size, agility and strength, he can take away the edge from pass-rushers and push defenders around the in the run game. On film, Sarell displays his talent, but seeing him in person facing off and performing well against some of the nations top defenders over several days at The Opening showed he was deserving of a bump and to be among the top five tackles in this talented group.OT Walker Little (Houston/Episcopal) ESPN 300: 100 When youre teammates with five-star DT Marvin Wilson, it can be easy to be overlooked, but as the process unfolds, Little is creating some buzz of his own. He has a massive frame and outstanding strength, and he has shown that once he gets his hands on a defender, the battle is over. Littles strength is impressive, but he has also flashed above average lateral mobility. Little is a prospect who has shown continued improvement throughout the evaluation process.G Robert Hainsey (Bradenton, Florida/IMG) ESPN 300: 51 Notre Dame commit Tough, versatile and competitive, Hainsey makes a well-deserved jump. He needs to continue to develop his frame, but he is a strong, aggressive player with good technique. Listed as one of the nations top offensive guards, Hainsey can line up at tackle as well as center. His best fit at Notre Dame will be guard, but he can bring valuable depth to the Fighting Irishs OL unit with his ability to play multiple spots. He has continually impressed with his competitive nature, and he demonstrates that he not only can be a productive player but also has the potential to develop into a tone-setter and anchor for that OL unit.C Cesar Ruiz (Bradenton, Florida/IMG) ESPN 300: 70 Ruiz remains the top center prospect while climbing the overall rankings. The four-star has shown excellent growth since his sophomore season -- not just physically but as an all-around player. He possesses excellent size and strength, and like his IMG Academy teammate Hainsey, he is a tough, physical player. Ruiz, however, has also shown strong football smarts, and if he stays on the same trajectory of growth and improvement, he could not only be an excellent college center but also quickly compete for a starting role.G Navaughn Donaldson (Miami/Central) ESPN 300: 88 Miami commit He is not only a massive, physical player, but he is also quite mobile for his size and flashes the ability to be an overwhelming presence at guard. Donaldson has managed to be among the top performers at offseason events, earning a move into the top 100.Notable new entriesQB Tommy Devito (Ramsey, New Jersey/Don Bosco) ESPN 300: 136 Syracuse commit He has really impressed in terms of his physical makeup and arm strength. He is a good athlete but not a dynamic one, which puts him in the pocket-passer category. He has many similarities to fellow ESPN 300 QB Sean Clifford.CB Jaylon Johnson (Fresno, California/Central East) ESPN 300: 190 Johnson was an impressive spring riser on the recruiting trail and on the camp circuit. His performance at The Opening and continued physical development triggered his rise into the ESPN 300. Also, he has few physical flaws on tape. Hes a fast closer and transitions cleanly with limited wasted motion for a corner with his length.CB Elijah Blades (Pasadena, California/John Muir) ESPN 300: 267 Florida commit The 6-foot-2 prospect was a spring riser with college coaches, and he backed up his stock with strong camp showings. Blades has exceptional instincts and awareness.LB Antjuan Simmons (Ann Arbor, Michigan/Pioneer) ESPN 300: 294 Ohio State commit The 6-foot-1, 209-pound player impressed in the spring and summer after adding bulk weight to his frame. 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Theyve been breathlessly described as an AFL juggernaut with enough young talent to dominate the finals for years to come.But Greater Western Sydney inaugural coach Kevin Sheedy says the clubs premiership window wont stay open indefinitely and the Giants must be prepared to seize their moment.Immersed in the game as a player and coach for almost 50 years, Sheedy has seen it all and knows plenty of teams have made it to the big dance in September only to throw away their chance at a flag.Just look at Sydney, who made a grand final in Rodney Eades first year as a senior coach in 1996 only to lose to North Melbourne.It took almost a decade - and a new coach - before the Swans broke their drought with a flag, while a shot at redemption has eluded Eade in 16 seasons as a coach.First-year coach, graand final, never been back to a grand final in 20 years, Sheedy summarised.dddddddddddd.Theyre very, very hard to get to.Speaking ahead of the Giants preliminary final against the Western Bulldogs on Saturday, Sheedy said there would be extra motivation for veterans Steve Johnson, Heath Shaw, Shane Mumford and Joel Patfull.Shaw and Mumford have each been locked away until the end of 2018 but Johnson, 33, and Patfull, 31, are out of contract and no certainty to play on next year.This might be their only chance to play in (another) premiership, Sheedy said.They might not be there in a years time, so theyve got to seize their moment, just like anybody at the Bulldogs. 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