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On the river he seems to bet very liberally

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I agree with your analysis except for the above.
People seem to want to pidgeonhole him as a hyper-aggressive player, but this is not quite true. His aggression definitely does not carry over to the river. I've replayed a bunch of his hands and see him consistently missing value bets on the river, even after being the last aggressor on the turn. I almost get the feeling that his game plan is to get to the showdown at all costs, employing aggression liberally, but to give up on the river if the situation is unclear.

-v