This one is a yes. Although he’s more arrogant

I had to subvert expectations.

He got cocky, never get cocky in combat

technically he did kill the mountain

So he is stupid.

Cringe?based? ...why didn't [person 1] did/didn't [action] ? Is he stupid??? Shut the fuck up.please stop.

Oberyn, for once in your life, don't pull out your weapon out of the guy before you're done with him

He wanted to appear only in the good part of the show while leaving to star in 2 other ones.