No, I doubt he will lose his foot.... but that injury / infection has been lingering for a while now and he still apparently can't pass a physical. It just doesn't smell right and I'd approach with caution.
i think all of the def players taken in the 2nd round can make an impact a big impact at that. While its easy to say Leonard since he's going to likely be the WLB and get a ton of reps there but maybe the biggest impact could be one of these late round LB or FA LB's picked up. I will be keeping a close eye on who's turning heads on special times during camp.