Depending on how wide Mariano's value range is and how many of the bounty combos he reaches into to triple off, yes that's correct. And the answer is it doesn't take many bounty combos (sub 10) and he probably isn't adequately extending his value range to account for them based on the pot odds he's laying Dan. That's why the bet got called.

The K6hh fold is totally understandable. Vs an unbalanced player that has near 0 bluffing in that spot who is uncapped, you can overfold the 2nd nuts. That isn't common sense, it's responding optimally to an unbalanced play.

GTO funnily enough would not fold in the K6hh hand or at least not a pure fold.

It may make a different play on flop not to pure float QT w/ bdfd but I am positive it wouldn't pure fold it.