Dear Wazuans,
Thank you very much for your comments. I have learned a lot from this. I especially want to comment on @Lolest's take that sometimes people are a beneficiary/victim of the environment that surrounds them. Thus Nyerere could not do but shine when his neighbors were dictator Amin and autocrat old Jomo. I had not thought about this. But this still misses something, I think. See next post for my final spin on this.
As for those who insist that Sankara was a greater man than either Julias or Nelson, I disagree. Sankara, like Lumumba, and Jesus before them, was a beneficiary of conflated time. Simply, he did not live long enough to make the mistakes that would have revealed him as human.
Sankara also fell in the typification of the romantic revolutionary/hero worship, largely driven by women and impressionable young men, a la Che Guevara, Hugo Chavez et al.
"The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth." (Niels Bohr)