Cmon, I understand your point and the argument you are making. Coaches spend hours and hours of time on their teams, would they really throw jeopardize their team by cutting talented white players?
A few thoughts. Look at the performance of last years virtually all-white Air Force team. Look at how a white receiver like Welker was nearly cut by Miami before finding his niche in New England. Speaking of New England, look how white RB Heath Evans was out of the league (doing construction wasn't it), gets called back in to the NFL and does fine as a tail back for a few games before the black starter was back. I think coaches have been programmed to undervalue white players at WR, RB, CB.
In baseball, remember the lesson of moneyball, how teams traditionally underrated the value of players with a high on base percentage. As a 11 year old kid I remember questioning why a baseball team offensive stat rankings in the Sunday paper was always pegged to batting average, not runs per nine innings, or why on base percentage wasn't ranked ahead of batting average, and yet baseball GMs and managers didn't appreciate this until recently. This isn't neccessarily a racial thing, but a good example of unimaginative, go with the flow thinking, although many white players do get lots of walks, so white players would benefit from a greater appreciation of walks somewhat. Think about it, an 11 year old kid was ahead of the curve. Another non-racial example of dumb management, look at the prepostrous contracts given to baseball pitchers on the downside of their careers like Barry Zito and Mike Hampton and Dontrelle Willis.
No baseball team would really be so dumb as to give a seven year 117 million dollar contract to a solid journeymen pitcher who might be worth five or seven million a year for a few years, would they?
Some food for thought for you.