Randall Bailey is one of the hardest hitting Jr Welterweights in recent memory, and Torres had a 100 percent KO ratio. Corley hit Cotto with a shot to the temple that dazed him, that wasn't Cotto's chin failing him it was a perfect temple shot, Corley is also one of the few fighters to rock Mayweather so no shame in that. I get your point and I agree Cotto was more sturdy at 147, but I wouldn't exactly say he had a "glass chin" at 140. For getting rocked by big punchers like Bailey, Torres.