re : Miffed, as played it looks very possible that Hero has a straight (something like A5/55 that bluff-raised the flop like Hero has been prone to do in recent history) so despite villain's donkishness, I don't think it's thinking too deep to say he's check-calling with a low 2 pair here. He can also have worse kings or donk-played QQ/JJ (GOd only knows how many times I've seen this lol) but since Hero has a K I'd be more likely to check behind.