My question is, why does this play have to be made with ace/rag? If it's folded to you in late position, you can raise with any 2. In fact, I'd rather make this play with a hand like 56o then A6o, because it's much less likely that you are dominated. There is also the potential of hitting an undetectable monster. Granted your opponent IS less likely to hold a playable hand as you have an ace in your hand, if he does call with an ace, he will surely have you outkicked and dominated on an A high flop.