I don't ever think he'll be MVP or anything, but a formiddable backup and possible future starter, why not?
Not a chance. He's already proven to everybody that he doesn't have the mental disclipline to do what's necessary. He got the fat contract, took the money and ran into oblvion as one of the biggest first round/#1 pick busts in NFL history.
The only comeback he's making is maybe coming back for a second round at the local Mickey D's or Burger Whop.
If he were serious about giving it another go, he would have kept up with the physical conditioning. Dude just wants another big NFL paycheck to replace all those millions he's already burned through and wasted.