Think about this one for a second. All these guys fight for a living so it isn't like they don't have some guts. I think I would say AS. He hopped up in weight numerous times. He took a fight after just coming out of surgery on one days notice to fight the guy that is the heavyweight champion of the world. As an old slowed down man he wanted to fight a young guy that was 15-0 with 13 Ko/Tko's. For comparison, GSP was self admittedly scared every fight. Bones refused to go up or take a fight on a few days notice. Fedor never made eye contact to save himself from wasting nervous energy. (he is a tough one to call, but I think he has a bit of the same sensation GSP has). There are guys that will fight anyone, but is that bravado, or a need to get paid, or maybe even an image they try to portray?