Well diver,
The Steeler teams of the 70're played a 14 game season and had a great coach, who did not wear his men out just to prove himself.
The Cowboys team of the 1990's often had a high seed and rested their players if memory serves. Most of their key players were younger as well.
Cmon, Coach. The players in those days worked much harder than the players today, at least at practices. They had to, as that was many times how you got yourself in shape then. There are no more two a days, and back in '07 they were more limited than in the past. There were no excuses used then if they didn't win the SB that they were worn down.
It is just a damn excuse is all it is, just as I think this idea that because he eased up on them the next year they won the SB. They won the SB that year because they played better in big spots. They jelled. If it was that easy just easing up on them they would have won more SBs since 08, right? It is just trying to find deeper reasons than they played better, when that is all it really is.