The 92 Cowboys were still hoping for the #1 seed, just a game back of the niners who finished their season on MNF. Of course we didn't rest our starters that year. The 93 Cowboys couldn't rest starters. They played the giants in their finale, an epic game that gave the winner the division, the bye, and home field advantage. Emmitt played an unforgettable game w a separated shoulder, and the rest is history. The 94 Cowboys also had to win their finale to lock up the #1, as SF and GB both finished only a game behind them. I don't know about the SB teams from the 70's, but with only a 14 game schedule, I would bet they also needed to win their finale.
I understand that the Cowboys have never lost their last game and won a SB, but the Cowboys have never had the #1 seed locked up with 2 weeks to play either. They say there's a first time for everything though, right?