Keenan Allen won't participate, as his PCL tear hasn't healed. That will hurt him on draft day, imo.
On the other hand, Kawann Short's draft stock has probably peaked after the Senior Bowl. He's not likely to test as well as a lot of DTs, so I'm not surprised he has suddenly pulled a hamstring.
Ditto Eddie Lacy, who will rest on his Bowl appearance and who has also picked up a sudden hamstring injury.