It's also worth noting that as nice as it is to watch a 00 Ravens, 02 Bucs, 85 Bears, or 15 Broncos defense.... that absolutely should not be the goal for a team to build towards. In all those cases it lasted 1 year and they couldn't sustain it. Too much of a grind and too many moving parts. It's rare to get to and it has no track record of sustaining. Top QB's keep their team in the hunt for like a decade. Rodgers with a not great defense won a ring by himself so an elite QB still yields you the same thing, it just also keeps your team with a much higher ceiling and gives you more chances.