btw: You clearly betray your ignorance about the NFL if you choose to define "success" as winning a superbowl ring. Especially since it serves to excaserbate my point, rather than refute it.
There has been exactly one black superbowl winning quarterback...ever. Doug Williams.
There have probably been at least 50 black quarterbacks. That puts your stat at 2%.
So there have been 50 starting black quarterbacks since the Superbowl began. How many starting white quarterbacks have there been? Around 1,000? If so, that stat would be 3%. WOW! What a huge difference.
IIRC, you said earlier that figure was 10%.
I guess you were once again full of shit huh?
Bottom line is this: Anyone that questions the observation that white quarterbacks outperform black quarterbacks disproportionately at the NFL level clearly doesn't follow the sport. And if you're going to be too ignorant to move beyond what is essentially an established fact and consider reasons why, then we have nothing left to discuss.