I dont know about discrimination,reverse or otherwise. The evident truth is that the vast majoritu of top level RBs in th NFL and NCAA are black. I believe that is more due to talent than race. Does that balance lead coaches to lean more towards a black HS RB? Perhaps. LUs RBs over my time have come in all sizes and colors. Talent will for the most part win out over color. If their is a bias,think it results more from the success other coaches have had with black RBs than from any sort of reverse discrimination.