paul williams didn't look old against Cintron he simply chose to box and fight cautious the first four rounds instead of going toe-to-toe, which he does sometimes.
Kermit, as retarded as the guy can be, is still one of the hardest punchers at 147-154. He has real one punch knock out power, so P-Will getting rocked by him isn't a big surprise. The only guy I've seen take a FLUSH shot from Kermit and not get rocked was margarito, but we all know he has (or had) an iron face.
I tend to think that pwill is on the decline too but I also think this has to do with the fact he's actually fighting bigger guys closer to his actual size, versus before when he was at 147 fighting guys 6-7 inches smaller and him outweighing them by 15-20 pounds on fight night. Even against Margarito he towered over him (and he never heart Margarito either). I just think it comes with the territory fighting at 154-160 pounds these guys are bigger, stronger and can take his punches. I drool at the thought of what would happen if he were to step in the ring with James Kirkland.