OIC...hmm I used to think that See Jo refered to the sect's creator.The term, 'shi zhu', is pretty much reserved for your master's master. I glanced over XAJH (can you tell yet I love that book?) to double check, and in chapter nine, when describing his master, that's what Yue Buqun referred to him as; to his students, he referred to his own master as "your shi zhu", "你师祖."