Barkley, 21, is the most hyped Giants rookie since Manning in 2004, and his impact on the Giants’ win column needs to be immediate to justify Gettleman’s choice of Barkley over a quarterback to succeed the aging and declining Manning. First, he needs to sign his contract (as of early last week, Barkley was one of seven top-10 picks in April’s draft yet to ink their rookie deals). Once he’s signed, Shurmur intends to feed Barkley the ball, and the Giants intend to be comfortable having Barkley on the field in any situation, given his versatility and their confidence in his pass blocking. So picking up Shurmur’s schemes, developing chemistry with Manning, maintaining sure hands as a pass catcher, and staying healthy all will be critical for Barkley to deliver on all of his potential and hype. He’ll also need the rebuilt offensive line to help, of course, mainly Flowers, who is switching to right tackle but still could be a major liability. One thing is for sure: Barkley will be the main draw to any camp practice open to the public this summer.