One thing I didn't see posted was Hendersons punches to the theighs. I see GSP useing that blueprint too.
TDD GSP has taken down the best of the best so at some point Nick will be on his back even if thats all he trained since he retired. So working on sub's will lessen GSP's GNP due to being extra careful.
My prediction is GSP will leg kick, fake shots punch to the theigh, and take him down late in the round to secure a strong dec.