Well, of the 4 people who have run sub 9.8, 3 have been below 6' and two below even 5'10". Tim, Ben, and Mo are all below 6' and Ben and Mo obviously could have gone faster than 9.79 in their primes, as seen from BJ's Seoul run and Mo's Edmonton run. It could be said Tim probably could have run 9.77 had he not put his hands up the last meters. I don't see any evidence really showing that tall athletes are better, except for one finally running sub 9.8. In my opinion, the same goes for the drive phase concept. MJ, BJ, FloJo, and TMont have all ran faster in their respective events than any of the people advocating a drive phase.
