Being a Mayorga fan, a huge one at that STILL, and a pretty big Judah fan let me comment on a few things:
Yeah Mayorga was 172, but that was after making weight, he shot up that high, or least he told Oscar he weighed that much come fight night. Also Mayorga at his best a few years ago, when he wasn't just hungry but starving, and was poor, and desperate, would KO Zab Judah. Mayorga is the bigger man, has the bigger punch, and the better chin. Now, I dunno for sure. Judah could outbox him, certainly Judah is much more skilled and talented, plus Mayorga's chin and resolve don't seem to be what they once were. Both guys are good friends so it probably will never happen. If it did, both men would have to be prepared, and hungry. I'd probably still go with Mayorga via KO, but I love the guy.