Checkback the river imo. Villain can check/call AJ/AT on the river, and he is probably not betting Kx twice. Seems like we're up againts AJ/AT, some smaller Ax and then some check/raises (not that often though).

Yeah def. xb river, there is no value to be had. We should bet boats, aq and bluffs, bet/call a3s and ak.
I would suggest never bluffing here too, villain is basically never firing this turn to xf this river. Overbet jamming for value with boats has merits vs some guys. Vs others, those who are not bluffcatch-happy, overbet jamming as a bluff is the only alternative to giving up.
Preflop is very marginal even with the rec in the bb.

Agree with everything above. Our range on the river contains only a couple of bluffs, (basically J10hh/QJhh and the like). So we probably can value bet full houses (we have AK from these positions, and if we have A8s we have A3s/A2s) and c back all our trip combos and play the river pretty good just doing that.

calling pre is ok with whale in bb. river bet is pretty thin vs a reg although if it was a fish i'd always value bet here but its a clear fold after river x/r. Need some solid reads here to think about calling.

What about value betting smaller (1/3 of the pot p.e.) to fold any raise?
Why the UTG doesn't shoot the third barrel?
It's because of he expects to us to bluff with a busted draw or a bluffcatcher/marginal hand?
Or it's because he thinks that any weak hand is not gonna pay anymore? Or both?

I would xb, he has a lot of AQ, AJ that he will call a bet with and you don't beat anything worse.