Seriously, who cares? Should Harbaugh add Jimmy Raye to the team just because he is black?
Harbaugh has just set out to hire coaches who he knows well and fit his system, have been on his past staffs, or have left an indelible impression on him in the past. What does color have to do with it? It's not like he purposely set out to hire only white coaches, even though there are better qualified coaches of other races out there.
It almost seems racist to hire someone just because they are a certain color.