Don't see the connection.
1.) GSP isn't considered to be a top gi player
2.) They aren't grappling on Sat (punches will play a role)
3.) They won't be wearing gi's, so if a no-gi guy beats a gi guy with no gi's on, what would that prove?
Oh, and just so you know.......
Most newbie's hate the gi because it's more technical, hot, uncomfortable, and takes longer to get good at. However, if you stick with it, many people start to appreciate the gi (not all, but many). Don't hate on the gi just because you didn't try it or stick with it.
Since it may come up: I play both gi and no-gi. When I first started I hated the gi for the reasons above and liked no-gi because I could slip out of bad situations more often when I made mistakes. Now that I've been playing for a while, I really like gi better because it's more of a skill / strategy game than no-gi. Of course, if MMA is your thing, then no-gi would, of course, be preferrable, but if you are looking purely at jiu-jitsu, there is so much more to the gi game and it is therefore much more interesting. <----IMHO