You're talking about being "clearly above" the rest of the conference. Tannehill has been awful in the last two postseasons... he singlehandedly lost that game to Cincinnati. If you can't trust your quarterback in the biggest game(s) of the season then you're kind of screwed.
My general rule is if you don't have an elite quarterback then you're probably not an elite team. Obviously it's possible to win without one but you need to be exceptional in other areas or you need to have an all-time elite defense like the 2000 Ravens, 2002 Bucs (who also had a QB having his best season by far), or the 2015 Broncos (who had a broken down HOF QB).
Of the remaining 19 SB winning teams since 2000, 16 had HOF quarterbacks... I'm excluding Joe Flacco (who had phenomenal postseason in '12), Nick Foles (we know the story there), and Matthew Stafford (who probably will be a HOF quarterback by the end of his career). I'm putting Eli Manning (2) in the HOF for the two incredible postseasons. Roethlisberger (2), P. Manning (2), Brees (1), Rodgers (1), Wilson (1), Mahomes (1) and Brady (7) are all obvious HOFers.
Even still excluding P. Manning from 2015, if you go back 30 years, 24 (80%) of the Super Bowl winning quarterbacks are HOFers.