Board Thread:Warhammer 40k General Discussion/@comment-18016240-20140707161751/@comment-8881468-20151217075737

that will probably depend on recruitment of Ahriman versus "birth" of primarchs.

alas: gestation of the primarchs was begun prior to space marines creation, howeve: how much time did theyx spend in the warp. f.e. Lorgar was pretty young when they  started his campaign to planetary rule, same for Corx or Guilliman and so on.

there could easily be Marines form terra in the legions that have been born before their primarchs.