i honestly didn't think he looked any worse when he fought jacobs, but he was 34. you're making it sound as if his performances couldn't possibly have anything to do with leaving his physical prime, and he could only look worse because he was facing better fighters.
is it that far fetched that it's a combination of both? he was 33 when he wrecked lemieux and looked to be sharp as all hell. he was a month shy of 35 when he beat jacobs. 35 when he fought canelo, 36 when he fought him the second time.
so yeah, it is funny, but not really the way you're implying. it's funny because "the elite" was nowhere to be found with a contract and a pen before the guy turned 34. which, for the style of fighting he has and the amount of fights he's had both as an amateur and a pro, is pretty fucking old.