>>96479998
You bring up a good point. Knight houses are varied, and then you have freeblades. Freeblades are obviously black shield equivalent but even houses get free reign. Probably because Houses are their own "parent" entity legion equivalent. So it's not just a subset of Hawkshroud, Terranis, etc. Still warp fuckery is a thing and a cruiser full of pre primarch legionaries, say approximately 3k points worth, could pop up in a warzone and get filed away under "alpha legion or some weird looking black shield band showed up today and confused everyone for three whole seconds before the killing began".

>>96480012
>spoiler
Seemingly so. If you don't have documented and still divergent in the heresy era, chapters you're not allowed to paint them slightly differently. Even then you'll still get someone who denies that even they existed.