Interesting 6-12 hand

Hey everyone. Im new to the 2+2 forum but im looking to improve all my games. So I was playing a little 6-12 stud at the local casino and the game is much tougher than it usually is but i stil think i can beat it. So im in a lat position with JJ and a K doorcard and ive got 2 limpers with a 6 and 7 up. Ive been playing pretty solidly so far and a raise it up. I get called by a guy behind me with an A up and the 7. So on 4th it shows AT K3(me) and 74 so its checked to me and i bet. 2 callers. on 5th it reads AT7, K3Q(me) and 754. checked to me and i bet. Heres the Really interesting part. i look to my left just as the guy is checking his hole cards and i spot KQ so his entire hand is AKQT 7 so now im thinking he'll just fold not sporting a pair but he calls and the other guy drops out. 6th street gives us both aces and he bets. Im thinking that i will have position on the next hand and if hes bets out the river then ill fold unless i caught a T J or case A maybe but if he checks ill assume that he missed 2 pair and auto bet regardless of my last card. He checks last card, given that hes the type of player who called on 5th w/o a pair shoul i still bet against his likely dry aces? Also should I have even called on 6th street?