User blog comment:Supahbadmarine/Too Many Loyalists!/@comment-1257337-20110604111635/@comment-10514705-20110605152317

The problem with mixed geneseeds is that no canon chapter exits with concrete double lineage. However, the Relictors (a canon former loyalist chapter) which have Unknown Geneseed are rumoured to have a mix of both Ultramarine and Dark Angel genseed. Therefore it must be canon-friendly to imply that a chapter has a dual heritage but non-canon friendly to openly state that they definitely do. So logically, the key here is for all of the Brotherhood chapters and similar chapters to change their established geneseed to Unknown (or to that of the Loyalist Legion they are descended from) then imply that they have a connection to their secret Traitor Legion ancestors. TardirProductions has done this quite well with his Fury Incarnate which (all though stated in the article infobox) only suggests a link to the World Eaters. As I can discern this would be okay.

Hell, I'll admit it myself, in my mind the Prophets of Redemption/Prophetic Forgiven in some way descended form the Thousand Sons. The difference with my articles and the other problem chapters is that I have never openly put in the article that their is a direct link between the two chapters, I've merely implied by allowing the Prophetic Forgiven ties with the Infinite Angels and by emphasising the fact that their geneseed mutation directly affects Psykers.

So to reiterate the key for keeping the mixed chapters is to suggest a connection to a Traitor Legion by highlighting similarities between the Traitor Legion (Pre-Heresy of course) and the Mixed Geneseed Chapter. Well I hope that clarifies my views on the issue, as well as my proposed solution on the matter.

P.S. Also, my solution would allow an outright ban on Loyalist Traitor Chapters and Definitive Mixed Geneseed Chapters, while keeping the Brotherhood (as well as similar chapters). If this was enforced then their would be a valid reason to delete the legions of evermore and the Loyalist 9.