River block turned call...

[FoxwoodsFiend]

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There is no hand he has wtih a 6 in it, at least I don't think. I also think he would be the turn with the straight be it A or 6.

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I don't know why you would think either thing. Until the turn, there's no reason why he can't have any hand. He raised preflop, put in a cont. bet and never had to call a raise so he could be making a move with 67 or AJ on the flop.
As for the turn, I guess this is read-dependent but I never rule out the possibility of somebody slowplaying a monster with position on the turn.