case in point:
Jack Del Rio
In 2003, Del Rio became the second head coach of the Jacksonville Jaguars following Tom Coughlin’s (who won two Superbowls with the NY Giants)dismissal.
On November 29, 2011, Del Rio was fired as Jacksonville’s head coach.
On January 27, 2012, Del Rio was hired as the new defensive coordinator of the Denver Broncos (who went to the Superbowl twice, won once).
On January 14, 2015, Del Rio was hired to become the new head coach of the Oakland Raiders, who are in the playoffs
for the first time in decades..................
It ain’t the coach,, it’s the talent on the field............
All I know is, his son sucks as a quarterback.