Unless the guy isnt very good, didnt for example raise an Ax flush draw and overcard or stroingish TP hand, the ace is pretty irrelevant except to KQ.
But in all these situations against a half competent player id expect to see some flop pressure because if we make it clear we like our hand against his pressure opp has lots of scary cards he can bluff at putting us to a quite tough decision.
Hence no flop raise means hes pretty weak or super-dooooper strong.