I was having a discussion with a buddy about the power of the inquisition, and if they could command marines

I was trying to argue the poitn that if marines split up again, I think it would break down to Codex vs Non Codex

DA
Space Wolves
BA
Templars (and Imperal fists?)

vs Codex Chapters

He is arguing that they could even go to calgar and tell him to jump and he would ask how high