Let's put this overrated narrative to rest.
Buffalo lost 4 Super Bowls in a row from 1990 to 1993.
SB 25 (loss to NYG)
371 yards of total offense
166 rushing yards
1 sack
0 turnovers
19 points
Lost by 1 point on a missed 47-yards FGA
SB 26 (loss to Washington)
283 yards of total offense
43 rushing yards
5 sacks
5 turnovers
24 points
Lost by 13 points
SB 27 (loss to Cowboys)
362 yards of total offense
108 rushing yards
4 sacks
9 turnovers
17 points
Lost by 35 points
SB 28 (loss to Cowboys)
314 yards of total offense
87 rushing yards
3 sacks
3 turnovers
13 points
Lost by 17 points
The Bills k-gun offense sucked in the Super Bowls. Jim Kelly was a complete disaster... 4 games, 2 TDs, 7 INTs, 3 FL, and 56.9 passer rating. Kelly and the k-gun offense had their best Super Bowl against Belichick's defense... most total yards, most rushing yards, fewest sacks (1), fewest turnovers (0), and merely lost by a missed FG. Buffalo had 17 turnovers in their other 3 SB losses where they were completely humiliated by the opposing defenses. So "mastermind" Bill actually shut down the Bills offense the least in those 4 games. The far more dominant defensive performances came from Washington and then Dallas twice.