Tippu Tip was a slave trader in East Africa, so he would be of little relevance to a study about the slave trade in West Africa. Moreover, the point of this article was about the Trans-Atlantic slave trade, which was imported in Africa.
So it’s so much that I need to expand my studies, but that you are trying to apply a very general analysis to what is meant to be a very narrow and specific assessment of a particular aspect of the Trans-Atlnic slave trade.