I can't quite agree, but see where he is coming from and it's possible. Floyd and Manny definitely do still get that superstar benefit of the doubt, but if you are to only take each of them for their last 2-3 fights, they look pretty human. They are 38 and 36, right around the age where fighters can suddenly lose it, and coming off fights which suggest that might be happening.
I have a hard time declaring Khan the next anything as he might get sparked out in any fight, but Brook could well be to much for Floyd or Manny of today. He's really damn good, a big welterweight with a good powerful jab, I dunno. Brook-Thurman would be something.