Board Thread:Warhammer 40k General Discussion/@comment-65.29.225.205-20130427160705/@comment-15803608-20170611191045

Let me clarify what I mean. Guilliman is currently Lord Commander of the Imperium, and he has the authority to dismiss and replace High Lords of Terra. This means that in rank alone he is at the very least equal (but most likely superior) in authority to The Inquisition. He doesn't answer to them. Secondly, apart from rank, Guilliman is currently seen as being a demogod in the eyes of the Imperium at large and that grants him a lot of credibility. To further add to this, Saint Celestine (someone extremely revered in the Imperium) has endorsed Guilliman. So if you're an Inquisitor and you try to accuse Roboute Guilliman of heresy, then you'd better be able to prove that he's trying to kill the Emperor because anything less and as far as the Imperium is concerned you're the heretic.

Now onto the Maiden Worlds. Currently there are 1,000,000 Human-Settled Worlds in the Imperium at least, while the Eldar Empire at it's height held a mere 10,000 systems (and I'm assuming those systems didn't have an average of 100 planets each). In the real life milky way Galaxy there are 100 billion planets, which means that even if the Eldar took over 10,000 star systems there would still be enough worlds to fit both empires hundreds of times over.