With Tim Shaw and CJ Wilson signing recently, the team only has top three picks Jon Beason, Dwayne Jarrett, and Ryan Kalil (all who could start) left to sign before camp officially starts on Saturday.
At #25, Beason is the most critical to sign. What happens around him could determine his draft value, as is typical. Above him, Dwayne Bowe (23) and Brandon Merriwether (24) are unsigned, as is (26) Anthony Spencer. After that, (27) Robert Meachem and (28)Joe Staley are signed, which will help. If any of the above sign, it'll help hash out what Beason may get.
Around Jarrett, the two defenders behind him have signed (#46 Lamarr Woodley and #47 David Harris) but the three offensive players aren't (#42 Tony Ugoh, #43 Drew Staunton, and #44 Sidney Rice). Since Rice, directly ahead of Jarrett, is also a WR, it makes things trickier.
Kalil has #57 Victor Abiamiri signed ahead of him, and having fellow C prospect Samson Satele behind him at #60 helps, but most of the 55-65 range picks haven't signed.
The Panthers haven't had a holdout since ill-fated center prospect Bruce Nelson held out 1.5 days in 2003.