I'd say it's a good laydown as well, he also could've been slow-playing trip J's as another hand I would put him on as well as a possible flush. A straight doesn't seem as likely but then again you have no read on the guy so you can't completly rule it out.

The only thing I might have done different with the K's is to bet more like 6-8 x BB (in other words $12-$16 to go) pre-flop, because anyone w/ a A-9 or lower are more than likely to just fold out. I mean it would be worse if say you made the same bet w/ the one caller and the flop came down 4h-6c-Ac and that guy is holding like a A/7o. Like you said you don't have a read on the guy but a bet that big would at least give you a clue and get most people to fold those babysitter hands...maybe or maybe not I could be wrong too.