I've never seen any Ethiopian herb I lived in south Africa and saw Mozambique, Botswana, Zimbabwe, Namibia, Egypt and that's it for my African countries I believe. I have seen some def hybrids growing wild in these places though...my thought is the tea trade and spice trade to India and Pakistan most likely brought fat broad leafed varieties into south Africa and they began hybridizing, then inbreeding for at least since the 16-1700s?
My theory on why Durban is so much faster than say rooibard or swazi or drakensburg. I guess to confirm legitimacy we would need a weed nerd from Kenya or someone very very familiar with the indigenous cultivars to know