1) Its close between checking and betting flop, but ofc betting is fine. The turn is a little more tricky, and if he would have bet bigger it would have been a fold imo, but this gay bet im calling for sure. And now when he shoves river I think it polarizes his range a whole lot and makes me wanna call, fwiw i think the river is the easiest decision of all three streets.

2) I think Griffeys reasoning for not 3betting a hand like AA vs a nit is very valid, although still not "standard". If I do slowplay pre, I'd most definitly just c/r or c/c this flop before leading it...

On the turn I think its an easy muck, we're talking about a one-dimensional player thats easy to play against, he never has a flush draw here, he never has AK, he's also rarely bluffing. So I agree with Renton this will sadly be JJ/KJ 90% of the time.