Doyle Brunson making mistakes here?

[chessforlife]

I just caught a bit of an invite tournament held a couple years ago. Doyle was heads up at the end with at least five times the chips of his opponent. He commenced going all in every hand, I assume believing that sooner or later the odds would make him the winner. He lost four or five or six all ins in a row, and lost the tournament. Does anyone recall what I'm talking about?

My question is, Isn't this a donkey strategy? I respect Doyle brunson, but wouldn't it be better to not let someone back in the game? He was pushing all in preflop with rags, and then once he had something like Q-5, and his opponent pushed all in with his small stack, and Brunson called again. I assume Brunson is relying on a type of odds theory that states over 5 hands, odds are he will win one, and with it tournament, but this doesn't seem like good play to me.