Now, this I don't agree with. When race is an essential important part of the equation, then it needs to be mentioned. For example, it is important to mention that Jackie Robinson was black--because he was the first black baseball player in the majors. In this instance, race needs to be mentioned because it is part of the equation--otherwise, he wouldn't be history. We don't say that Columbus was the first white explorer to discover a new continent because simply, all the explorers were white! Thus, when you discuss Columbus' history--it isn't necessary to mention his colour, because it is necessarily assumed and thereby inconsequential. The same would go for Isaac Newton. His colour would be assumed--merely because 99% of philosphers, scientists at the time were white. People that are remembered for their race, like Dungy and Lovie now, are done so because it is, again, part of the equation that makes them history.
Which returns us to the primary point we've been making all along (the one your losing sight of): we mention Dungy and Lovie's race because, in this situation, it is historically unprecedented and thus, history.