Your statements are entirely wrong then. You absolutely cannot consistently win in the NFL with an also-ran QB.
Thing is, despite the bravado around the franchise, Dallas actually
IS a perennial favorite to win. The Cowboys have the 8th most regular season wins over the past 20 years, and 6th most over the past 10. Teams ahead of Dallas in the 20 yr list: Patriots, Steelers, Seahawks, Packers, Ravens, Colts, Saints. For the 10 year period only the Chiefs, Patriots, Steelers, Packers, and Seahawks are ahead.
Guess what every one of those franchises had for long stretches during those time periods (including the Cowboys): a top end QB.
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I'm not a Cowboys fan, and normally i relish in their self destruction. But they are sort of an anomaly in major sports when it comes to playoff ineptitude.