To many fans are mesmerized by the fact that Diaz comes straight forward. This is bad striking movement. Condit countered with a textbook response: move out of the way and counter at angles. They could fight a hundred times and if Nick did not completely upgrade his attack Condit would win every time. Condit controlled the Octagon by using his opponents aggression against him.
Condit vs GSP is going to be infinitely better than Diaz vs GSP would have been. You can not keep moving forward against a high level wrestler like GSP without getting planted on your back. GSP would be ground and pounding Diaz for 20+ minutes in that fight. Not to say Carlos has much of a chance either, but he has a far better chance than Diaz does.