I didn't say it was a friend. It was an in-law. Family. I have another family friend who made about about the same or more but in that range, in the 1990s teaching hi-school. Taught at least 25 years. Pr Capone's chart verfied that claim.
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.