Legend!
Red like roses, fills my dreams and brings me to the place where you rest...
Actually the way I see it is this. Emp is the ultimate instinctual Farseer. He is linked to a future God of Humanity (one that is actually tolerant of some xenos perhaps but with Humanity dominant) by being the seed of that god.
So he gets future echoes that tell him : at this time do this , knowing that if it doesn't happen Humanity will end up dead. Everything he does furthers the cause of creating that god, even though he himself doesn't know it. At least until he 'dies' and part of his soul goes on to join that greater gestalt. Until then he is still likmited. That's why he has to be GIVEN the revelation in Outcast Dead. Yet once he has it, he accepts it.
Bit of kicker for him - he sees he has to keep Primarchs ignorant of chaos, yet that leads them to being corrupted. And he sees that he had to do that only afterwards.
Me and Tom are working on an alternate Heresy where Magnus does take the Throne.
Red like roses, fills my dreams and brings me to the place where you rest...
It does seem to me like a huge part of the Heresy could have been avoided if the Emperor had just been a little more forthcoming with his sons.
To Magnus at Nikaea: "Look, I have this big chair at home for you to sit in, and I was going to give it to you as a graduation present, but if you keep playing with the warp kids in the reality next door, I'm gonna take it back to the store. Oh and I'm stopping your pocket money."
To Lorgar and Guilliman at Monarchia: "Guilliman, stop being a dick to your little brother. And Lorgar, to tell you the truth, I am a God, but people need to work it out for themselves, that's the point of faith. Have a lolly pop."
To all his sons at Ullanor: "My sons, we still have much conquering to do, but unfortunately there's a massive Eldar portal under the imperial palace and it's starting to leak daemons and shiz, oh yeah by the way religion is real. LATERZ."
"Paws off ma cheeze!"
Chief Educator of the Horsemen of Derailment "People demand freedom of speech to make up for the freedom of thought, which they avoid." SOREN KIERKEGAARD