BTW, pr_capone, the site your chart comes from also says this under Salaries:
Please note that all salaries in charts below do not represent exact amounts and are provided for reference only.
Bill Belichick learned to film signals of opponents from the former Chiefs, and Charger's coach Schottenheimer. Others like Edwards, Johnson and Cowher did too. They learned from the CHEATS and CHEATERS who still couldn't win.