KK 3bet pot 8-high

I would play this hand straight forward and bet the turn too.

We can cbet turm too.
As played what is his range on the river?

yes protect our hands from draws and not lose initative, if you dont make it big JJ will probably also call the turn

Your hand is strong enough for 3 streets of value. I would barrel all the way and be cautious if raised.

Playing this way is fine - if you do it as an exception rather than the rule - to balance your play. You should worry some, but not too much, about the draws here. They are slightly too many for me to be totally comfortable. But it is not at all as bad as most think to give potential free card here. The reason is that people will bet when checked to, so the street gets bet anyway (protection really means getting in money in the pot with the best hand, not preventing villain from seeing the next street).

Do you agree with the xc on river?

Yes, it is a close but definite yes. We engineered the situation and bet sizes are normal throughout. I am calling and expecting to lose 50%+, but not 70%+.

Is AQ the weakest hand you are calling here?

I am not check-calling that on turn, but generally speaking, TPTK is always tends to be borderline:)