Board Thread:Warhammer 40k General Discussion/@comment-69.143.134.163-20150419161351/@comment-24037808-20150608100835

Dunno how much weight could have the Primarchs statements about the 2 lost brothers. There are TONS of things the Emperor hide to his sons. Lot of them very important. Web way, Mars, even Chaos itself was hidden from the Primarchs knowledge.

The only source could be from Space wolves telling waht they witness during the battles. What they fought? How they looks? What they scream during the battle? "for the Emperor? For the Chaos Gods? For freedom?".

Do we ever know?