I think Fnord is just alluding to one of the great advantages of being in position. The player in back can put in a small raise (in relation to the stacks) that directly threatens the player in front's entire stack. Assuming the player OOP is competant, Fnord then has an incredible amount of information about the strength of villain's hand and can proceed with the hand depending on what he holds. Just as importantly, it gets money in quickly with a big hand before cards come that can beat you or kill your action. For example if Fnord holds 77, a spade is very unlikely to beat our hero since As is on the board, but it very well may kill his action. However, playing this way with air, in my experience, tends to be badly -EV. I think Fnord would agree with this. At least to an extent.

How often does the player described with KK/QQ/JJ bet the turn unimproved in your observation? If a call is correct against this opponent with AKo, what other hands should call here for balance?
Without directly answering your question, nothing pleases me more then seeing players blatantly playing their huge hands noticably different then there more marginal ones. IE raising flop draws, top pairs, weak overpairs, etc., while calling flop bets to try to play a massive pot on later streets with bigger hands.. ie sets. When I stack off with a hand like AK TPTK, it's often because I pick up on something like this. Fnord- I believe you were at the table to see a similar hand, where villain had a big draw where we got it AI on the turn.