Timbuktu: The Stripping has Began - Pt2

This an ongoing topic, carried from the first posting wherein we came across a question in Masonen's and Fisher's piece, concerning the adoption of Islam in ancient Ghana. That question was, to reiterate:

Why did the ruler and people of Ghana adopt Islam in 1076?

It is a warranted one, since it is generally understood that the religion wasn't widely adapted in that area, and certainly not by