User blog comment:Supahbadmarine/Too Many Loyalists!/@comment-1932673-20110606150904

Wait a minute, Codex Space Marines specifically states that ALL traitor geneseed is held on Terra under Stasis and secondly the Imperium is so idealogically rigid that they wouldn't consider using traitor geneseed, especially considering it was probally a decree issued by the Emperor or the Primarchs, and the Thousand Sons' geneseed is the most unstable ever created, (uncontrollable mutations were rife amongst the Legion and it only stopped after Magnus was discovered because he inadvertently made a pact with Tzeentch and only realised until the Burning of Prospero) so theoretically the Blood Ravens could not be a Thousand Sons successor, no matter the hints that GW made, and Cal XD, they never actually said that the BR were meant to be descended from the TS, it was only to add mystery to the chapter. No one would dare do it, because if discovered it would cause a civil war that outstrips even the previous civil wars, such as the Malcharion Heresy.