Seems that Changchub Dorje's teachers Adzom Drukpa and Nyala Pema Düddul are referenced often in Namkhai Norbu Rinpoche's teachings. However Changchub Dorje's third teacher Shardza Tashi Gyaltsen is not mentioned as often, if at all. All three were undoubtably very profound teachers and tertöns... curious why Norbu Rinpoche chooses to focus primarily on the cycles of Adzom Drukpa and Nyala Pema Düddul when he gives teachings associated with Changchub Dorje's teachers?
Is it that Shardza Tashi Gyaltsen wasn't as influential for Changchub Dorje? Or does Shardza Rinpoche being a Bön lama have anything to do with it? Can't see that being the case when Norbu Rinpoche is so good about focusing on the essence of the teachings and straying from sectarian politics.