[all-lucky7777]

Then what is canon? that could easily be a difference in opinion. You can't say that whatever you get your fluff from is any more accurate than Ichor's. Even so, Black library is supposed to be the one who makes the fluff, period, right? Who else writes the backstory in codexes or things like Index Astartes? Where/what is your 'source', Romulas?

I actually think that Romulas has the Regiment thing, Ichor. Yes Cadia or Mordia would have thousands of regiments, But those are major military worlds, designed for that, and renowned for having thousands of regiments. Therefore the vast majority of worlds would have 1 to i don't know, 100? That makes sense.

On the other hand, I don't think that cadia has 1000's of PDF regiments, the codex lists them as having regiments all over the galaxy fighting for no more reason than they were needed. Look in the codex on the page with all the at ease guardsmen painted different colors. And I think i read somewhere in my BFG book that battlefleet Cadia does the same thing, meaning Cadia is designed as a mobile army, to assist in wars along with the fleet. Assuming that I'm assuming right.