I love your article, overall; but this statement is factually-incorrect. "Big Brother" has had two winners who were women of color -- Jun Song and Kaycee Clark. (With Josh Martinez being the only man of color to have won)
Overall, your assessments about The Cookout's success are spot-on. My prediction is that, next summer on "Big Brother," we will see more multiracial alliances naturally develop across the entire cast.
BTW, here's a recent piece of mine about the overall impact of CBS's diversity targets:
https://medium.com/perceive-more/what-cbss-new-diversity-targets-mean-for-reality-tv-a530dd6118da
Jun Song herself even retweeted it!