Master, Krystal and Grim (Christopher Grim) are in the tree, and you are also marked as their Master. But for Pozican, he is under Dim-Mak, did he return later to be your apprentice as well? Like I said I'm out of resources, so what you see here is everything I was able to find, it's not complete truth.
According to my findings, you had the following as your Padawans:
Shin, Shade, Krystal, Noki, Tao-Kin, Kadaj, Mandez, Jack, Dardanus, Kaitos, Natas, Rowe, ChrisGrim, Dal'van, Mysté, Serbar and Slim.
Anyone missing there?