KQs, vs unknowns

To be honest. First you have to think about BB's cappingrange which is likely to be AQ AK KQs TT+ and after he capped the Flop he is just supposed to have KQs or better. But the question is whether you should take reasonable measurements and assume that he's a reasonable player who'd never cap the Flop with a worse hand. What has been your impression on this player up to this point? Has he been playing aggressive or passive or haven't you picked any read on those guys? I think folding the Flop is a little too weak since the only hand you are just drawing with 1 out against is KK but against AK and AA you have, combined, around 4 Outs. So given the Pot Odds it's even worth calling on just 3 Outs.

You could call down your hand and hope that BB's is some aggressive maniac type of guy but the chance that he caps preflop and caps the flop with something worse is just so small that i'd take this small risk of folding the best hand on the turn but most of the time being pleased , when the cards will be revealed on the showdown, to have folded the worse hand and being glad to not have invested more money in the pot. On the River you just have to call. King is somehow good, you are now ahead against AA but he could still have AK with 6 combinations and 99. So just call the River and why did you actually cap when it was damn obvious that he does have FH or AK?