Even the 1972 Dolphins ... they played most of the season with their backup QB Earl Morrall. Bob Griese came back to start in the Super Bowl. That was a heckuva hard line Don Shula drew about starters not losing their jobs due to injury: "Thanks for getting us to 14-0 and an AFC title -- Bob's back now, so take a seat!" Would not happen today.
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EDIT: Nitpick -- Hosstetler's title with the Giants came after the 1990 season (Super Bowl XXV in January 1991).