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On the other hand - if the flop comes 632 and I have AK, if you are holding T9 or A7 you are drawing pretty thin even though I didn't pair up making it a value bet with the best hand.

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Well with T9 (or any other undercards), it's not too thin. Since the cards are live, it's like a 4:1 to the river. Technically, they might be correct in calling a flop bet if the pot is big enough, assuming their cards are still live.