Assuming Rose comes back to be the same player he was is...a huge assumption. For his sake, I hope he does, but I think the odds of that happening are low, particularly given how much his game revolved around his athleticism. That might influence Melo. If Rose is still an All-Star, I can see them doing some damage, but if he's anything below that, the Bulls would be a dark horse contender at best (still pretty good, but not unlikely to unseat Indy or Miami).