Huge and literal FF. Killing him an thereby handing over the leadership of ZANU to Mugabe by default was a crucial miscalculation by the Rhodesians pushing the remaining moderates out of ZANU and thereby delegitimizing them. This is one case where I think an assasination really did change the course of a nation.
It s a little known fact that ZANU actually started as a
moderate breakaway from Nkomos militant ZAPU back in 1963 with guys like Chitepo and Rev. Sithole at the helm and a wish to mobilize the people in a broad popular uprising - the ethnic Shona-Ndebele divide between ZANU and ZAPU only materialized gradually afterwards.
https://en.wikipedia.org/wiki/Herbert_Chitepo