Do you think your opponent calls three streets with middle pair - on a board where straights and flushes arrive?

How differently would u play this hand OTR?

dont mind the play on the flop and turn but check fold river almost always, you are never getting called by a pair, and he should be having a decent amount of sets, flushes, straights and 2P

he should not have many flushes. Remember he calls a 5x raise from the bb, which defines his range to 22-AA, AJs,AQ-AK, KQs/KJs, and player dependent may call with J 10/109 s etc. He should never have a bunch of suited aces, because these would often get 3 bet since your raising a post, and your often raising light(ace x is a good blocker). His flushes that are reasonable are hands like AK/AQwith a bd fd, but you block the king s and the jack s hits river. Even if he is super loose, and calls with hands like j9 ss he can no longer have these hands OTR, even jq ss. So since he doesnt have many flushes, that doesnt mean he doesnt have hands that beat your hand. Reasonably villian has 12 combos of sets because 33, would simply be very ambitious. However, I think the jack river is a bad river to jam because the only combo that can reasonably call are the jack x suited(which im not sure he would play pre) and QQ even is unlikely for him to have in this spot. I would say most of the time villian has the AQ-AK with clubs(which you block) 99/88/10 10/55/j9cc/jqcc. On the jack river, i think you have a x fold. A jam simply turns your hand into a bluff and there are better hands to bluff with like AK/AQ cc and AK/AQ with a spade. I think if it was the poster who called flop/turn though/ the jam is easy because his range is less defined.

Thoughts on the flop sizing, should we go bigger here?

Interesting thoughts about his range OP, what's that based on?
If I had to guess I'd say it's based on all the things you'd like to be true when you hold this exact hand.
Same exact spot, same action/river/villain - but now you have A9cc. I guess you just x/f because villain calls so many 1pr hands?
I'd bet my house you jam whilst resoning he doesn't have much Jx, and all Tx folds to the jam.