I was simply talking about highest EV flop cbet. Its certainly interesting to examine the decision as the biggest difference between the EV of betting and the EV of checking behind.

I don't really understand why you think K82 is the best flop to cbet. The best flop to cbet here still seems like AAA. KTx makes sense for checking behind is clearly a good play with air. Using this logic we could say T98 isnt the worst cbet because checking behind gives us almost no ability to win the pot without hitting the turn or river.