The RPI is a decent tool to measure teams, but certainly the tweaks made before last year have benefited the mid major teams. I think the committee takes that into account.
For sure, ku and aTm will be considered strongly for 2 seeds even though they are at 15 and 16 in the RPI. And nobody would say UNLV is a better team than those 2 even though they are ranked higher in the RPI.