Do all branches or schools of Tibetan Buddhism revere the Dalai Lama, and if not, which do not?
This question is far more complicated than it might seem at first glance. First, we have to make the distinction “revere” in the meaning of looking up to as a great spiritual master and inspiration on the one hand, and “revere” as your supreme leader and administrative head on the other hand. If you choose the first meaning, almost every Tibetan reveres the Dalai Lama as one of the greatest, or possibly the very greatest, of the spiritual masters of Tibet, and as an emanation of Chenrezig, the Bodhisattva of Compassion and protector of Tibet. In the same way (but to a varying degree) they usually revere all the great spiritual masters of Tibet, regardless of which lineage or tradition they belong to. There are other masters that are also considered emanations of great buddhas and bodhisattvas, including others who are also considered emanations of Chenrezig. This does not mean that they all see the Dalai Lama as their spiritual leader, as if he was some kind of “pope” of Tibetan Buddhi