Wow the optimism here is...inspiring.
My opinion - this injury is going to hinder Portis all season. He's taking the pre-season off to rehabb, if he responds well to the rehabb, they'll stick him back in there and hope he holds up. After coming up a career high in carries last season, I'd be very surprised if Betts got more carries even IF Portis is healthy.
And, if his shoulder takes a wrong hit and pops out again, his season is done.
I understand the risk/reward, but to just say "he's going to be fine" or "he's a gamer" and draft him at 4 like you were going to last week, I think is being very...optimistic.