Basically there are two different styles of run offense, zone based and gap-man based. Zone requires smaller, athletic linemen like Garrett Bradbury, Jason Kielce, Andy Levitre. They have to be able to movend get to adjacent linemen and cover space. Power gap schemes involve a lot of downblcoks and double teams and things of that nature. Big, slower linemen who can destroy the inside gap. Picture what we saw with Greg Roman a few years ago.
Th Patriots ran power plays all the way to the super bowl and the Colts decimated our run defense doing the same. As defenses continue to get smaller players to play the pass it makes sense to draft massive linemen and smash the small players. I like the approach.