Forum:SH Archive/Holocrons and Sith apprentices

I was wondering, since Darth Desolous became a Sith Lord through apprenticing himself to Darth Phobos' holocron, shouldn't we list XoXann and Darth Revan as informal masters of Darths Krayt and Bane, respectively? Is there any reason why we shouldn't? I think it's pretty clear that he (Desolous) became a Sith only under her (Phobos) guidance, and it is unlikely he trained under Darth Vader or Darth Sidious.