Roger is my all time favorite NFL player. I will get that out right now
But the 1976 Superbowl followed the 1975 season. At the time, that was just Staubach's second career pro bowl season. He did have a Superbowl title at the time. He had only thrown for 15,878 yards before the start of that season, and 52 touchdowns. He wound up throwing for 153 in his career and over 22,000 yards passing. Had Staubach never played after that Superbowl against Bradshaw in 1976, he would not have been in the Hall of Fame. 146 of Bradshaw's 212 career TD passes came after that 1975 season as well. 1975 was Bradshaw's first Pro Bowl season.
Combined at the start of the 1976 Superbowl, those two do not hold up to what Favre and Manning have combined to do if they meet in the Superbowl in three weeks.