Nick Foles, Joe Flacco and even Eli Manning prove your point.
Don't even need to bring up the jag standard bearers of Trent Dilfer and Brad Johnson.
About 20-25% of SBs are won with QBs that aren't normally great, but either had amazing defensive runs and/or got hot themselves for a few games.
Or also had great special teams. Zurelein played a big role in us not obtaining a higher seed. Most games come down to less than 3 points, and, if your kicker is missing the amount of field goals he missed, then it's not surprising you might end up missing out on a higher seed. Zurelein, for example, is a big reason we lost to the Bucs. He missed I think 2 or 3 kicks (one of which I don't blame him for as it was a 59+ kick). Had he made one of the two makeable kicks, we probably win that game. So, that cost us the 2nd seed, meaning we missed on playing Philly who we'd smashed for each game. He also missed a lot of extra points, including against the Raiders, which puts more strain on the team. If he was better on XPs (assuming he makes one of the kicks he missed against the Bucs), there's a real possibility we could've finished with a 1 seed. With that, we could have been much deadlier.