River is definitely ugly. The fact that he shouldn't bet anything worse for value makes it close to a fold, but people do weird things on paired boards.

If he has Kx then he's betting bigger I would say, so I'm discounting that. I have seen plenty of guys who will bet the smaller of the two board pairs because they're scared that you'll bomb it if they check. Even though they're rarely getting called by worse. It's possible that he's angling for a hero call from Ax, or possibly trying to get you off a split if you both have Ax.

My prefered line would be to bet flop and turn even though it's thin. You have position and he's probably calling Tx for both streets. If he raises thenfolding is fine, and you have an easy check behind on the river, or a fold if he leads out.

We block QJ which makes it ugly... this really depends on villain. I would call and note take. We need to be good 25% of the time. Maybe they have us beat 90% of the time but losing 15% of the required edge isnt so bad. They can have some odd hands here. How does he play 66 / 77 etc. Might be some sort of A8 hand. We effectively lose to some combo of Tx or Kx limping UTG. JJ blocks a lot of that too... KJ JT leaving some K rag hand or T9 T8 QT maybe. I assume mostly people are opening KQ / AT.

I think he has Ax often enough to call , add some pure air trying to steal the pot and i think its a call without any reads on how tight he is.

I think that this river not is ugly, vs missingCB is std that villains bet in turn with bluff, i not think that villain can bet any T here, because have showdown and is one hand weak still, river is a easy call, he make bet very weak, i think that one T he can bet more because you can call with any PPhigh or Ahigh and need extract value with a bet/fold

GL