re: Which Expansion was Less of a Fit: Ark/SCAR, Aggie/Mizzou, or OU/TX?

Sure, but LSU and southeastern Louisiana is pretty damn unique as well. If LSU had been a SWC school that was just now joining the SEC now, people would say they're not a fit.

I agree though that it doesn't really matter. Texas doesn't have to be Ole Miss to be valuable member and will find its own special place in the SEC just like other expansion teams have, except Mizzou.