https://www.usatoday.com/story/sports/nfl/2020/02/23/first-nfl-black-quarterback-modern-era-marlin-briscoe-deserves-recognition/4845446002/
I remember when Briscoe played QB for the Broncos, he was electrifying, but the idiotic racist believe at the time was that a black man could not play QB in the NFL, not smart enough. As the article says when traded to the Bills he was converted to WR. Of course the Bills had no QB at the time, just dumb. Then the Bills draft James Harris, who started for the Bills for a few games. Harris had a decent career, but I think Briscoe was a better QB and better athlete.