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In page Super Bowl V:

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The Colts were an unspectacular but well-balanced veteran team, led by 37-year-old star quarterback Johnny Unitas. He had regained his starting spot on the team in 1969 upon recovering from an injury that led him to miss the majority of the 1968 season. Unitas played inconsistently during the 1970 regular season; he threw for 2,213 yards, but recorded more interceptions than touchdowns. He also had injury problems, missing two regular season games and giving Earl Morrall more significant playing time. Morrall put up better statistics (792 yards, 9 touchdowns, 4 interceptions, and a 97.6 passer rating), but head coach Don McCafferty decided to start Unitas for the playoffs. (According to Jim O'Brien, Morrall was just as good as Unitas in the players' opinion.)[1]