100/100 ( equals $5/$5 ) PLO 6 players

CO ( 30k ): nitty postflop, loose preflop ( always openlimps ), passive elderly guy - knows I can make bluffs in huge pots and that I am very aggro
BTN ( 20k ): Drunk crazy guy, losing over 200k, goes all in blind ( pot pot everytime action is on him )
I am on the BB ( 60k ) with AcQcTd8h

2 folds, CO calls, BTN pots, sb folds, I call ( could just get it in vs 100% range preflop vs btn but CO could easily be trapping but I can manouver it postflop I thought ), CO calls.

Flop ( pot 1600 ):
KdJc7h

I check, CO checks, BTN pots 1600, I call, CO makes it 4K, BTN pots, I shove to push CO out and maybe clear out my outs and I am basically never drawing dead, CO snap calls KQT2 no bd fd.

What do you think about my play and opponent snap calling?

I guess if he is reading situation correctly I cant really have KKxx there ( would just get it in against 100% range with significant equity edge ). So I am probably on some kind of a draw and he really dominates my draws with his top pair and openender - blocking my outs. And if I have something like 77 or JJ he still have nut outs. So it kinda makes sense to call off his hand although I was very surprised when he snapcalled and showed me that hand.