I see what you're saying, but Moon never won more than one playoff game in a season, and never made it to a conference championship game. That Oilers team went to the playoffs seven seasons in a row, was loaded with talent, but could never do much once they got there.
"He also holds the postseason mark with 16 career fumbles – in just 10 games. During a divisional playoff against Kansas City on Jan. 16, 1994, he fumbled a mind-boggling and record-setting five times." Source
His playoff record (3-7) is closer to Dan Fouts (3-4) than anyone else. At least Fouts went to two conference championship games.