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I'm fairly confident he would bet the river with any pair he deemed good enough to raise with pre-flop.

In other words, I would expect him to bet JJ-88 a vast majority of the time, and AK much of the time as well, though not as often.

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You gotta tells us this stuff in the OP, b/c what it really comes down to what you mean by aggressive post flop: does he bluff raise? Is he going to bet JJ or AK when checked to, etc.