User blog comment:Supahbadmarine/Official Canon Policy/@comment-3258762-20130219102314

1: Space Wolves are a no. Salamanders are a maybe, I cannot decide until I get some form of evidence that means they cannot have a successor chapter.

2: Tardir said it best, I believe

3: At an absolute most a 100 worlds, unless they are outside the light of the Astronomicon (Which means they are probably not going to do anything)

4: They cannot excede Necron Tech.