Here are the 1972 San Diego Chargers. After finishing in 3rd place (6-8) in 1971, the team dropped to last place (4-9-1) in 1972. The free-fall continued, and they didn't see a winning record until 1978.
Hadl regained the starting role in 1964, and remained there through the 1972 season. John led the league in passing TDs in '68 and '71.
He was also the Chargers' punter during the '64 and '65 seasons. Hadl played for the Rams, Packers, and Oilers from 1973-77. He made 6 Pro Bowls, and was the last QB to wear a number higher than #19.
Also check out the 1968 and 1971 Chargers.