[CalledDownLight]

I think that I shove the last $50 in. He has diamonds like never. 86s is possible, but unlikely and 88 and 66 are out of the question. 67 and 65 are his most likely hands and your kicker plays vs. those. Like you said 7h5h is the only possible way he ever gets there with a draw. I guess he has A6s once in a while, but folding would be pretty bad here given that you let him bet both the turn and river.

edit: 88 is not out of the question as in he never has it, but I think an 16/8 would raise this from MP2 the vast majority of the time.