I think you are giving the villain too much respect in saying he is going to lay down 2 pair here. Its very possible he could put you on AK and take it all the way here. The reason I favor the just calling is because the gambool method forces you to put the rest of your stack in on the turn, in which case your odds of winning have gone way down if you don't hit something on the turn. If the turn brings say a 3d you are a 60/40 underdog against 2pair, and if it pairs the board you could be drawing near dead with the exception of the Qc. Also, when you say you're "ahead" here against 2pair, you are only a 55/45 favorite on the flop. So this is equivalent to saying pushing pockets into AK is +EV which everyone knows is untrue. As it stood you were 60/40 dog when you pushed on the flop, if the turn had brough a 3d you would be a 22/78 underdog.