I wouldn't c/r the flop. An OESD or FD is not going to fold. You're c/r is probably only going to chase out weaker draws, and you want those guys to stay in! It sucks that he hit his gutshot against you, but that is the kind of play you love to see, since it makes you money in the long run!

On the turn, I would figure I'm probably behind. But you've got odds to draw to the FH, so I would call. And on the river, I would probably make a crying call due to the pot odds. He could be betting two pair.

JJ: Sklansky says playing against 3-4 opponents sucks. You want more like 5 opponents for set value or 1-2 opponents to give your JJ a better chance of holding up. With JJ, you goal is to get one or the other1-2 opponents or, 5+ opponents. Which means only limping/calling in loose games to entice 5+ limpers (a raise will probably only narrow the field to 3 opponents). And raising in tight games to get down to 1-2 opponents. (where limping/calling will probably only entice 3-4 opponents to call).

AJ: Cant remember exactly what Sklansky says, but AJ can be tough to play. Especially out of position. With AJo I usually dump it from EP. From middle position I usually limp in and see if any strength comes from behind me. Raise it from late position. Proceed with caution on the flop if you encounter any resistance.