Turnover ratio is more important than sacks, in the grand scheme of things. The average turnover ratio for a Super Bowl era during the official recognition of sacks is +7.3. Only three teams had a negative turnover ratio, and won a Super Bowl in this span (the 1983 Raiders were actually -13! Also, the 1987 Commanders and the 2007 Giants). Protect the football and take it away, and you will typically win big. The 1985 Bears were +23 (with 64 sacks), the 1990 Giants were +20 (with 30 sacks), the 2000 Ravens were +23 (with 35 sacks), and the 2013 Seahawks were +20 (with 43 sacks).
12 times did a Super Bowl champion have a ratio lower than the average. The Cowboy teams of the 90's were +7, +6 and +2 respectively.
The Cowboys are presently +1.