Jose Aldo expressed in the UFC 163 post-fight press conference that he'd love to go the lightweight division if UFC matchmaker Joe Silva presented him with the proper opportunity.
That likely meant a title shot or, at the least, a No. 1 contenders bout. It'd be hard to say no to that offer, but Aldo should remain at 145 pounds for a number of reasons.
He's had some tough weight cuts, and his conditioning is his biggest question mark. But it looks like that might be a problem of the past. If Aldo can maintain his weight to avoid the rough weigh cuts, he should stay at featherweight, where he is the unquestionable top dog.