"Hmmm, hard to say, because not all weaknesses are easily perceived as such, in the power itself. We know about more than a few broken villains, whose only notable weakness is their lack of mental stability. Other powers have more debatable ones, like the way Kaiser takes a longer time to make larger, more resistant structures, or the way Lung needs to be in the thick of battle to even activate his full arsenal. And given the way powers work, I wouldn't be too surprised if I found out that, say, Legend didn't have one he chose to hide. But I'd be a little bit surprised."