I cannot think of one that did not. I will grant you that most of the Super Bowl champions could do additional things other than throw deep.
But I think the deep threat concept is very real. Its like Nuclear Weapons, just because you don't see it, you know it is there and it is a deterrent for safeties sneaking up to the line of scrimmage.
Heck, I think you can go through a whole game and not throw a single deep ball. That doesn't mean the ability to throw the deep ball had no affect on the game.
Maybe I'm not remembering correctly, but the winners on the SB list really don't seem to have that many WRs that could be considered deep threats.New England 24, Philadelphia 21
New England 32, Carolina 29
Tampa Bay 48, Oakland 21
New England 20, St. Louis 17
Baltimore 34, N.Y. Giants 7
St. Louis 23, Tennessee 16
Denver 34, Atlanta 19
Denver 31, Green Bay 24
Green Bay 35, New England 21
Dallas 27, Pittsburgh 17
San Francisco 49, San Diego 26
Dallas 30, Buffalo 13
Dallas 52, Buffalo 17
Washington 37, Buffalo 24
N.Y. Giants 20, Buffalo 19
San Francisco 55, Denver 10
San Francisco 20, Cincinnati 16
Washington 42, Denver 10
N.Y. Giants 39, Denver 20
Chicago 46, New England 10
San Francisco 38, Miami 16
L.A. Raiders 38, Washington 9
Washington 27, Miami 17
San Francisco 26, Cincinnati 21
Oakland 27, Philadelphia 10
Pittsburgh 31, L.A. Rams 19
Pittsburgh 35, Dallas 31
Dallas 27, Denver 10
Oakland 32, Minnesota 14
Pittsburgh 21, Dallas 17
Pittsburgh 16, Minnesota 6
Miami 24, Minnesota 7
Miami 14, Washington 7
Dallas 24, Miami 3
Baltimore 16, Dallas 13
Kansas City 23, Minnesota 7
N.Y. Jets 16, Baltimore 7
Green Bay 33, Oakland 14
Green Bay 35, Kansas City 10