Troy Aikman was a superb QB who sacrificed personal stats for TEAM success. Had he been in a different system his numbers would have been much higher.
Bradshaw actually was a product of the system and benefited from a great defense and a solid running game. He lost the starting job a number of times early in his career and didn't really settle in as the guy until AFTER their first SB win. In fact, he lost the startng job to Joe Gilliam that season (1974) before getting it back. Terry had a big arm but was too careless with the ball as his 210 INTs (to go with only 212 TDs) show.
When you compare Bradshaw's numbers with his contemporaries (Staubach, Stabler, Anderson, Tarkenton, Griese, Bert Jones, Jim Hart, etc.) he isn't very impressive. Not bad, just not impressive. The Stealers winning 4 SBs is impressive but Bradshaw isn't. What in impressive about Terry was his toughness and that he came up big in big games.
Aikman was the most accurate QB I've ever seen play, and I've seen a LOT of QBs over the past 45 years of watching football. Had he played in a more pass-oriented system his numbers would be amazing. Under Norv Turner, Troy played in a balanced, deep-pass offense where we didn't throw a lot of dinks and dunks like in the WCO but went downfield more often andutilized Emmitt in the running game a lot. Actually, it was similar to what Bradshaw played in but Troy's numbers a a whole lot better than Terry's.
There is no way we would have won 3 SBs in the 90s with a different QB. Aikman was the perfect guy for the team we had and the style we played. Had he played in a system like Marino's or Peyton Manning's he would have put up numbers like them.