Here are the best HC's in the NFL right now in career W-L.
McVay - Zero years NFL experience, coaching out of college
Nagy - Zero years NFL experience, coaching out of college
Andy Reid - Zero years NFL experience, coaching out of college
Mike Tomlin - Zero years NFL experience, coaching out of college
Lynn - 6 years of NFL experience (as a backup journeyman)
Carroll - Zero years NFL experience, coaching out of college
Reich - 13 years of NFL experience (as a backup journeyman)
Payton - Strike player for 3 games in the NFL, coached the next year
See a trend?
English language lesson time.
The "those ranks" remark refers to the NFL in the previous sentence. Not "football."
I reject your assertion now that you changed it to football. I reject your new assertion that 70% of kids who play football at any age are black. I reject that NFL experience is associated with success as an NFL coach as proven by the best coaches in NFL history.
Sorry.