5. Colin Kaepernick
Yes, we’re stretching the truth by calling Kaepernick an active NFL player. However, he never retired from football and attempted to make a comeback several times. But franchises don’t want to know about the polarizing civil rights activist because of the baggage he brings.
There’s no denying that part of the NFL fanbase loathes Kaepernick more than anyone else because he represents everything that they hate. It’s also arguable that Kaepernick doesn’t want to play football again because he makes more money from endorsements (via Huff Post).