User blog comment:Supahbadmarine/Official Canon Policy/@comment-3341288-20130219004921

1. Space Wolves i believe we agreed would not be allowed anymore, too many reasons why it would not work.

2. As for Salamanders, there is no reason why successor chapters would be impossible.

3. Loyalist Traitors. No, just no.

4. Human Factions? I say way less than a hundred, and this is TOPS. Anything more is too much to be feasible. Or the stronger they are, the more problems they should have.

5. Human Faction Tech, well i say they can be more advanced in some areas, but cant be perfect or overly. For all its flaws and stigma, the Imperium is still very advanced. Or tech wise, maybe greater tech means fewer worlds as a balancing act?