Personally I think Hopkins' lack of action would be his downfall. Do you think he could work his way through Kessler's jab for twelve rounds and when there, do anything meaningful? Mauled? Kessler is the stronger man and the barrages of assaults that Calzaghe kept giving him are the only thing that put him out of his stride.....and I don't think that Hopkins is capable of that anymore.
Kessler would have very little chance vs B-hop, hes a very predictable fighter. He fights one way, he cant fight on the inside. Hopkins would disfigure this guy.
Kessler is way too upright and lacking defensively for that to be true. He is also a fighter who falls in love with one combo and lacks a plan b...how would a fighter with Hopkins timing NOT be able to hit him at will???