I mean technically DRG has a higher single target potential if they can preform their super super strict rotation and nail every position (Which i think the math is something like .7 seconds to nail dem positions before its a loss). So shouldnt they have a higher cap at the moment when MNKs are nearly the same they always have been?

MNKs still pull amazing damage, and have more tools then ever to keep that damage up. Plus they are right now the only class other then BLM with unlimited resources (Though they do take a DPS hit to do that, but seriously, unlimited resources is a big deal)