Fight night weights don't really tell you who is bigger. Maidana may choose to only put on a certain amount of weight as putting on 15-20lbs makes him feel too bulky & even slower. It also may be that he trains better.

I will say I think Rios is getting very underrated here. He's far more savvy than he's getting credit for. He uses his jab exactly how an inside fighter should, it's a weapon on the way in, not just an irritant to buy time. I think he'd cause trouble for plenty of the 140lbers even if he wouldn't be quite the same force.