As a guard player I would be fine with this but on one condition.
That is girlyman comes back and tries to take control of the empire in the name of the emperor.
The high Lords hate this idea.
Boom, massive fucking civil war. The high lords excommunicate the ultras and their successors. 1/3 of the imperium sides with ultras.
Chaos dicks around in the mayhem.
The Tau expand.
Primarchs return and pick sides.
And it all comes to the emperor dieing and becoming a god, which would be 15 books from now and about a decade from now.