Board Thread:Warhammer 40k General Discussion/@comment-58.178.141.62-20140405080514/@comment-80.237.234.150-20140409162921

2nd founding was only related to the splitting up of the loyalist legions, aka: already existing marine units were split up and you had the first successor chapters made up of pre existing units. (take f.e. black templars, soul drinkers and so on or the splitting up of ultramar)

those were marines that had fought in the GC and HH and Scouring times and now they "simply" adapted to a new leadership pattern.

creating a new set of 900+ astartes from a certain pattern from scratch (okay 70 marines ^^)  will take far more time though that is possible.

those groups could be created at the same time yet not belong to that founding as it was specifically created  as the one where existing units were split up