[Aviston]

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But in this situation I think he'll be bluffing or betting an inferior holding/draw at least 25% which is enough for us to raise for a free sd.

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Maybe it's just me, but it seems to be a tad strange to straight out bluff a preflop raiser when an A hits the flop. Unless of course he guessed (correctly) that I had a high pocket pair.

As for a draw, he certainly doesn't have a flush draw considering he had the perfect position to raise the flop for value. I can't imagine he'd pass that up in favor of betting the turn when his odds of hitting the flush are now halved. I really don't see any other draws unless he's donkbetting a five outter.