I think that we can reduce the likelihood that a bunch of pair hands are around here. AA, KK, and to a lesser degree QQ would have made a bit more noise here. TT seems outs. 99 and 88 might not have raised in the first place here.

By reducing the percentage of villain's range taken up by pairs in such a fashion, we realize that AK is going to take up a huge percentage of villain's range.

The value of folding another AK here makes the river bet valuable in my opinion, particularly against a passive opponent who would not call it down.