I've used a 26L Gumba Gear Elite several times in Africa. I've done 11 safaris in Kenya. Although I'm usually on the FF, your options mostly leave some gaps at the shorter end. If possible I'd have the 150-400, 50-200 and 12-100 or something like that. The Ellies and Giraffes etc. will overwhelm your 50mm and probably 40mm on m43 as they get closer. There are also some times when animal action is wide. Sometimes you are quite closer than you would expect and you want a wider environmental view. Keep your iPhone mostly for videos. Have two good cameras and 3rd one as a backup. You don't want to change lenses too often. If you don't have all the right gear rent it. If you have extra space add a smaller spare tele. More than in many locations I've seen and experienced numerous camera gear broken and damaged due to the terrain, vibrations, dirt, and human error like drops/falls.
EBH