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I suspect the latter because he's against an aggressive player, and the flop bet he knows is discounted as far as meaning anything at all....

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Its interesting that you said that becuz I suspected that Barron was checking this turn with the intention of calling. I imagined that his reasoning went something like this: He knows that this aggressive player will always bet if he checks, so checking and calling gets the same amount of money in the pot as betting. But the upside of checking and calling is that barron can never get raised when the aggressive player happens to have a better hand, and barron may also induce the aggressive player to bet a hand with very few outs that the aggressive player mightve even folded had Barron bet out the turn. I really think check raising this turn on this board is a bit over the top for Barron's holding. So thats why I think Barron is checking and calling here. I could be way off here, but thats my best guess.