It would explain why he looked lethargic and out of shape this offseason. I don't see any way he drops to the 2nd day. I still think he goes in the 1st round. Worst case scenerio is he drops to the 2nd round like Shaun Rogers or Marcus McNeil.
I gotta say, I would still be heavily interested as long as you did your medical homework. The Cowboys don't need rookies to step in right away, and they don't have enough roster room to fit 10 draft picks. This guy is a legitimate Top 5 pick when he's healthy and full speed. I would also look at guys in later rounds who are good talents who might need a "red shirt" year that you could stow away on IR. Michael Bush and Brian Smith in particular.