I actually think he is "Ready" for the ML at this point, at least as a bench OF. Maybe if he only plays part time he can avoid injury. It doesnt really make sense to me either, but they have to try something or just release the guy, let his body rest, have him do drills (slowly) somewhere and come to camp ready to try and make the bench.
Anyone else I would say playing some in the Winter would be good for him, this poor guy I would say just keep him away from anything moving and limit his movements. Gotta feel for the guy, he has the tools, he obviously wants to play and he has fought back from every possible injury there is, just needs some freaking luck.