I think Houston has better shotblockers than GS had last year. Every guard get's beat to the hole. It's up to the 4 and 5 guys to change his layup.
My take is Curray and Ellis were better players than Harden. Harden thrived as a 6th man. How many 6th men come into their own starting?
Lin is 6'3", Harden a couple inches taller. Big enough.
And no, I"m not a believer in guards winning anything by themselves. You still need the rebounders, the intimidators, and some change of pace.