Board Thread:Warhammer 40k General Discussion/@comment-24114582-20140517121210/@comment-6078851-20140518154315

for codex-compliant chapters - i imagine there are times when they lose very few astartes during numerous campaigns, which could result in them having too many astates in their chapter to be codex-compliant. so a selection of veterans, commanders, and champions across the chapter would be 'promoted' to be the upper heirarchy and the tutors of a newly founded chapter: sigismund of the imperial fists is one such example - he became the chapter master of the then newly founded black templars, and along with a selection of imperial fists veterans they taught, led, and expanded their new chapter.