I hunted with him years ago in the Selous with one of hins PH (the late Crispin Mayandika) on buffalo for two weeks. We always followed the same herd of about 170 heads, sometimes mixed with another herd of about 70 cows. As it turned out later, they were only buffs in this concession and there were only 2 bulls with them. I shot the bigger one, meaning a barely 2 years old bull measuring at least 32 ''. You are right when saying it was my fault shooting it, but if there isn't any comparison and the PH urges you to shoot, what would you do ? For myself, I never hunted with PD again.
By the way: The only evening we started a campfire (Crispin) was on that day I shot the bull and we came to camp already in the afternoon (the other days PD and his client were the first to be in camp again and he never lit a fire).