Spikes? I like this guy, but no, too much competition at ILB.
Cunningham? Probably not. Tough position to play, lots to know. While the competition isn't stellar, they're decent veterans. I don't think a rookie waltzes into it. But if he's good, by the end of the year he'll be a significant part of the rotation.
Price? With Moss and Edelman ahead of him and Welker most likely back in by week 7 or so, and solid competition from Tate, this doesn't seem like Price's year to shine. And that without mentioning an increased focus on TEs and maybe a more balanced running game.
Gronk or Hernandez? Maybe. Gronkowski has a more direct battle with Crumpler for playing time but he probably opens more holes and may get more TDs. Hernandez probably gets more snaps and more receptions. I think one of these guys has a bigger statistical impact than my choice for the real impact guy.
McCourty. Weakness against tough passing offenses like the Colts, especially on third down is where the nickel plays an important role, and I think he beats Wilhite for starting nickelback before the bye week. This guy has size and speed, and by all accounts he hits hard, covers well and isn't afraid to tackle a RB. While interceptions are nice, keeping guys from getting open is critical. I don't hate Wilhite, but he always seemed a step behind and the ball seemed to go to his man at all the wrong times.
I expect Butler and Bodden to start at L & RCB through the end of the year, but McCourty may see some time split wide on the bigger receivers and he's a nice option to play against clever TEs like Dallas Clark who can't be covered by LBs, jamming him at the line and then matching him stride for stride. It won't be flashy, and he won't get the INTs but I see this guy as having the biggest impact.
He'll get his playing time in many ways, taking it from Wilhite and the safeties. I sincerely hope, with everyone healthy, the nickel defense by the end of the year will be Meriweather, Chung, Bodden, Butler, and McCourty. And that is 50% of the snaps.
On top of that, as the media tells us, he'll be an absolute force on special teams.