Board Thread:Warhammer 40k General Discussion/@comment-112.207.229.75-20160517103444/@comment-28917471-20160520201655

Again, the Emperor had all the rights to keep the Webway project a secret. Let's not forget that the Emperor was not only the father of his Primarchs, but also their Master.

Also, the Emperor is not a 100% accurate oracle, so he could not forsee the Heresy.

And for how long would the Emperor need to lead the Great Crusade?How and when would it end? The Emperor could not know that, so he had to come back to Terra to unite the Imperium through an extra dimensional bridge. Plus, the Emperor was making war since the time of the Unifaction Wars, he earned his right to retire to Terra and work on much greater problems.

The Primarchs were also no small children any longer, they were breed for war and that's why the Emperor left them to continue with His Great Crusade.