Yeah that definitely makes sense. Okay, so here is a one more hypothetical question/scenario, then I'm done lol. Sorry for the stupid questions, if I make my own fluff for a new army, I want it to be realistic.
So, say the White Templars are an Imperial Fists successor, and the same situation happens, Chapter and Chapter Master killed, only 15-25 survive. The White Templars chapter would be documented as extinct, and the surviving members may simply be added to the Imperial Fists. If this were to occur, would the Imperial Fists possibly create 2 specialist squads out of the surviving members, and let them keep their original armour colour from when the White Templars existed?