Red Nemesis
It seems like it was Djem So, because he is so strong? I don't have the link to the Russian site anymore so I can't help you. Actually, could somebody post that please?But my guess is that he spec'd Djem So, with an added emphasis on everything else. (He memorized everything i think, as can be seen by him teaching Zannah.)
You misunderstand me: it is my understanding that Bane had not mastered any particular form. He is a Djem So practitioner, but I believe it was previously established that he had not mastered it. I was checking for clarification before I proceeded.