Now were're making progress. We've moved fro "top 5 all-time" to "a great defense."
Let's try it this way. 2008 to 2017. I'm going to use the top 3 Ds for each year (and, yes, I know there are a number of ways to define "top 3)
2008 - all 3 top Ds made the playoffs. One of those, PITT, won the SB
2009 - all 3 top Ds made the playoffs. None got to the SB
2010 - all 3 top Ds made the playoffs. One of those, GB, won the SB
2011 - all 3 top Ds made the playoffs. None got to the SB
2012 - 2 of the top 3 Ds made the playoffs. One of those, One, SF, made it to the SB
2013 - all 3 top Ds made the playoffs. One of those, SEA, wone the SB
2014 - 1 of the top 3 Ds made the playoffs. That team, SEA, made it to the SB
2015 - all 3 top Ds made the playoffs. One of those, CAR, made it to the SB
2016 - 2 of the top 2 Ds made the playoffs. One of those, NE, won the SB
2017 - 2 of the top 2 Ds made the playoffs. None of those made it to the SB
In 7 of those 10 years, one of the top 3 Ds made it to the SB. It is not reasonable to say all 7 were "extraordinary" over the course of NFL history. They were good THAT year (although most were good, not extraordinary, for a number of years).
Now, back to an elite QB. Is it easier to have an elite QB than a top 3 D? I'd say no, but admit, it's debatable. BTW, in 6 of those 10 years, a non-elite QB won the SB. I'm not arguing elite QBs aren't important, nor am I arguing I wouldn't love Miami to have one. I'm responding to the poster who, again, emphasized an "all-time top 5" D, as if anything less than "all --time top 5" wasn't as important. I'm only pointing out a top 3 d for ANY random year has a high correlation to SB appearances.