Diaz is a fighting fans favourite. If you like watching fights, you love Nick Diaz. He is the definition of a born fighter.
He had his hands by his waist when he was fighting Paul Daley for christs sake. Literally just stood in font of Paul with his hands down, taunting him. He shouldn't be doing things like that against striker's like Daley, but he does. How can you not love Diaz?
GSP for a few years now has been incredibly boring to watch and seems to have a major lack of killer instinct.
People see this playing safe strategy as an indication that GSP has evolved and improved over the years, I actually see it as the opposite. I think Pierre is mentally weak and that his major lack of self confidence and killer instinct is going to cost him some day. What better fighter to expose those particular holes than Nick Diaz himself?