The first one who comes to mind is Nkhomo. Only thing was, he came from the minority tribe, can't remember the name of the 2 main tribes. Mugabe and Muzorewa came from the majority tribe, so with Mugabe out of the picture, it could also be Muzorewa. Hard to say how Mugabe's death butterflies things, but perhaps the leaders form some sort of coalition. In OTL, when they were trying with the Internal Settlement, they wanted Nkhomo to join in the worst way, but he wouldn't. If he had, and Mugabe could have been kept out of power, his army might not have gone quietly away in the night, but in the long run the country would be so, so much better off. The man is just pure evil. I've always believed that even with just OTL Internal Settlement, the life of the average black Zimbabwean would be better than it is today.