stacks, we should assume he felts when we donk and he has KK+ so we have no equity
also, we never make it to the river when he has KK+ because he shoves the turn so c/c calcs are off since we're only peeling one card to see if it's a queen, ace or a king
then if he has AK he probably checks it back on the turn
if he has KK+ we don't get to see the river unless the turn is a queen

when we c/r he shoves KK+ and folds AK
I think these assumptions make c/c the best play but also put c/f really close