I think Kai's best is better than Dex's best, but I don't think Kai is anywhere as near his best as Dex here. Kai's delts and chest have annoying weird shape from the front. Dex's back double bi is pretty much as good as Kai in the pics above. Hmm, condition wise Kai doesn't have this year anything like what he had last year for some reason, although I do think he's capable of something insane that we haven't seen yet, maybe a Ronnie-style re-invention of what is possible for the human body.