Off the top of my head, I think that top pair-jack kicker OOP is not what I want to play when it comes back to me 3-bet, and I fold on the flop. I'm sure I would have done this in the heat of the moment.

Thinking about it, I wonder what CO 3-bets on the flop that he overlimps preflop. 55 or 22? I doubt it. K5 or K2? Please. KJo or KTo makes some sense, although even with these I would expect 14/10 to raise to isolate the loose limper. An oddly played AA is the only other thing I can think of.

Having thought about it, I still think this is afold, but I'm likely not ready to play 5/10 yet.