Board Thread:Warhammer 40k General Discussion/@comment-8881468-20150204091114/@comment-8881468-20150213102637

alpharius and corax were not around

as corax is legion  number 19 but emps tells him that only 17 brothers are around. (deliverance lost)

alpharius was the last found so by definjition he is out.

lorgar knew about it, as did his legion (i tihnk it is in betrayer or so (around the same quote on the myth of the remaining legionaries joining the ultramarines))

, same for horus and dorn horus was the first found and dorn expressed his knowledge in the "the primarchs" anthology when talking to malcador