sorry i still don't see how KK here helps as blockers but not AA, could you please explain
A significant chunk of the hands that call a 3-bet preflop and then ship this flop should be hands like KQJT, KJT9, etc., against which KKQ9 is a lot better than AAQ9.
Whether you would prefer AA here depends on how many AJxx or A8xx hands you're expecting to see. I dunno about that.
