OldVengeance;5569299]The whole idea of Revan inspiring the rule of two doesn't make sense. Not only was it not really the case, (all his force sensitive underlings were still sith) but even if you go by the Dark Lords doing the one Master/one Apprentice thing, Revan and Malak weren't the first either. Exar Kun and Ulic Quel Droma did that before them.
The underlings were never true Sith, they never held any real power. Revan taught to train only one apprentice at a time, while Kun trained a whole brotherhood