Viniketa-
You hit the nail on the head! Flexibility seems to go out the window at times. I always find the sectarianism of Buddhists to be rather embarrassing .
But I think that Tibetan Buddhism is getting a bit of a bum rap in this thread. I must say in my experience that the Theravada tradition can also be extremely sectarian. For example, I left at that time my Theravada temple with permission to study Tibetan in Dharamsala. No one complained. But when I went to Thailand for a visit, the abbot of a temple where I had stayed before told me I would have to re-take the bhikkhu ordination as I had become "Mahayana by association" if I wanted to stay for a long period of time.
The Tibetan masters I spoke to, including Lama Zopa Rinpoche and Jangtse Choje Rinpoche (the next Ganden Tripa) told me that since my novice ordination was in Tibetan Buddhism I had a good connection to the lineage. They said it was absolutely unnecessary to re-take the gelong (bhikkhu/full) ordination from a Tibetan master, since the Theravada ordination was valid from a pure ordination lineage. LZR and Jangtse Choje also told me I should participate in the Sojong/Posada with the Tibetan monks with no problem, and I should have a stable conviction that "I am a Gelong".




