Huh, Mosely didn't stop, in fact he did the opposite.... he started chasing the KO and stopped boxing. Every time he got into his corner Nassim Richardson was telling him to stop looking for a big shot and just put gloves on him..... Shane got over aggressive and stopped boxing, played right into Floyd's game and got pieced apart.
Pac may be a fast SP, so were Corley and Judah....... and we know how that ended. Pac is fast, but so is Floyd and I don't think Pac is that much faster than Judah as far as SP's go and Marquez and Mosely are far from "slow", speed aint the answer..... Floyd is just as fast as Manny, different application in how they use that speed, but nonetheless, Manny wont have a significant speed advantage..... one he has been accustomed to having in last several fights.
Curious, what gives you the opinion that Floyd's chin is suspect? He has fought and taken big shots from a list of notable KO punchers and not seen the canvas..... He went down to a knee against Hernandez when he broke his hand on his forehead..... arguably Zab did knock him down, it was never ruled a KD though. Closest i have seen him come to getting KD is against Corley who did rock him pretty good and Mosely who hit him with a shot that would of and has finished many a fighter, but Floyd managed to stay up....... Chin, not so suspect if ya ask me. Manny on the other hand, seen the canvas several times.
Not comparable, different styles, different fighters and different weight classes. Remember that DLH fought Manny at the end of his career and at a weight that was well under his "ideal" fight weight. Matter of fact, Manny actually outweighed DLH on fight night. Floyd fought DLH when he was still a more active fighter (not his prime, but close) and at a weight he was comfortable making at the time, Floyd was also the smaller fighter in that fight.
If ya make that argument, what about PBF's dismantling of Marquez, who gave Manny 2 of the toughest bouts of his career........ Floyd tooled him, bad!