I agree with most of this tho I'm not sure lorgar a plan actually worked. Post shadow crusade sanguinius makes it to macragge and we all know he made it to terra, so guilliman should have been able to. I personally think it was by choice that guilliman didn't go
Stacking shelves, standing in a fridge room restocking milk, jobs the people don't want to do... for 9 hours... for no pay
This is what I was thinking as well, with Guilliman pointing the lighthouse thingy at his own realm instead of towards Terra, to me it was a clear sign that he was just waiting to see who won the war.