It's interesting to make these timelines. Gives a great perspective on when things happened. I think there was another exercise along these lines posted a few month ago. I'll try to find it later, since that might give you some more information.
However, inevitably, such list will always be a small sample of the huge number of interesting teachers that are out there.
Even if we just limit our selves to those who are reasonably well-known in the west, then your list, for example, omits many historically-important Burmese teachers, especially Ledi Sayadaw, Goenka and U Ban Kin. And still-living teachers, such as U Pandita, U Tejaniya, Pa Auk, and their various western disciples. In the Thai area there is Buddhadassa, Maha Bua and students. In Sri Lanka Nanananda. I'm sure others could add another couple of dozen...