Aus.Morgo:
That 200-400mm is neither small or light. I held it one time with 5D3 attached and it seemed front heavy. I won't deny that it is a sharp lens, but all the technique you would use with a non-IS lens is still good practice--the longer your lens, the higher your shutter speed needs to be. My lens are mostly stabilized but my best results in Africa and India were at 1/800s to 1/1500s on shutter priority. As long as I kept the camera and lens steady with higher shutter speeds, even my Sigma 50-500 OS did as well as my 400mm DO IS.
Game rides start before the sun comes up and end just after the sun goes down. In camps there are often hides where you can observe and photograph waterhole action at night. You need the fastest lens you have for those situations. An f4 or wider is best. Certainly a monopod or a tripod can be very useful at a hide. Your 70-200 IS L II with a 1.4 TC will work best at those times.
Often, small critters and herd animals will be seen right by the roadside. 200mm and up will be too much. Sometimes even 70mm is too tight if a large creature is right at your window.
MedicineMan: The only advice I can give you is that I would want a wide zoom for the 5D rather than the 35mm--although I'd take that Rokinon anyway for night sky and potential vistas.
