a) for some reason Kongo starts a bit too far south and thus makes a TSL start for Zulus suboptimal
b) Mali would be rather close to Kumasi
c) Ethiopia would have room to expand, Egypt is not too far away in the north though. The nile is on the map and I think a luxury as well.
d) Morocco and Carthage would have more space in Africa, but would be close to Spain and Rome, iirc I founded a city in what would be Tangiers in my games because of the nice strategic location and nearby luxuries.
I have never played a TSL game, so I checked it out. I used this TSL guide theory to see what might happen.
1) Kongo may start close to a presumed location for the Zulu, but that isn't an impediment. I tried a Sumeria start, and the Persian settler was literally on my border. And Zulu would obviously want to eat Kongo for an appetizer. South Africa would be a great start location.
2) Presumably, close city-states would be blocked. Huttusa didn't appear in my Sumeria start, and since they start as settlers too, they would have to shove off and settle some other place. That being said, the area of Mali was of little interest for luxuries or other resources. They just don't have much Sahel there. Kumasi could get replaced though. It's spot wasn't bad.
3) Ethiopia/Nubia/Kush is a good spot. There were two luxuries nearby, plus iron.
4) Tangier is a good spot, as is Carthage, which could be upgraded to a civ as we know Jakarta will be. Morocco is a possibility
5) Madagascar would be problematic. There's no luxury or iron there, but Tsingy is. And working tiles around Tsingy would move you pretty fast through the early tech tree to get embarkation to spread off the island. They might block Zanzibar from spawning if Madagascar were in the game.
6) Zanzibar has a lovely spot as well, but I don't see them getting replaced with such a distinctive suzerainty bonus.
So, based on this theory, it would look like Zulu, Ethiopia, Ashanti, Morocco, or Carthage. Mali (also Ghana, Songhai) is devoid of resources. The several small empires that occurred in and around the gold coast are unlikely except Ashanti. Madagascar is possible, but unlikely.
Not that I necessarily buy into this theory, but it is an interesting approach. Firaxis could easily modify the TSL map to fit any new civ in by adding or moving luxuries and bonus resources. If they were to bring back the Gold luxury, it would probably make the Mali region far more intriguing.