Actually The Great Phantom if you play KOTOR 1 when you speak to the spirit of Anjunta Pall he says are MAsters hunted us down the ones we betrayed im only going by that when i said about the schism. I dont think Simus(floaty head) was Marka Ragnos master and he was not always just a head he fought Mark Ragnos for Mantle of th Dark Lord of the Sith and lost but using Sith magic simus managed to keep himself alive but only his head it was in a Sith Jar and Naga Sadow eventually killed Simus.