[shant]

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He has to know you have an A, and most players won't lay down top pair to the checkraise.

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Why does he "has to know" about the A? Hero bet out last after everyone checked. That doesn't really cut in stone that he has an A.
That's the kind of situation where BB could really raise with a good 8 since it's even fairly unlikely that anyone has an A at this point.

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My thinking is coming at this from the mind of a typical opponent, not good players. An ace has to be in the range of hands this typical opponent can put the Hero on. Also, I think the times a typical Party player checkraises an 8 on this flop are low.