[Mark It Zero!]

this is why you reraise JJ preflop. You're playing 6 max, is there a reason why you are playing this weak? OESD got there as well as a gutshot, so you have the 3rd nuts, not 2nd.

You've got top set on the turn, how is potting it an overbet? There's plenty of cards that can hit the river that will either a) kill your action or b) beat you, if you're not already beaten. So to answer your question, no leading $100 isn't bad... but it's much better to isolate and not have people behind you for 2xBB with you having 0 info on them.

It's very doubtful he has an overpair after calling flat calling twice, so you can safely rule that out. Mostly you're looking at him etiher having a flush draw, a straight, or something like 87. Pot it and hope he doesn't pop you back.