Completions yes, wins no. In the end it is about the W not how you look. Poor Romo, big bad gunslinger but yet cannot seem to win when it counts. Being a winner is more important than being good.
The reason Brady will be the #1 all time QB, not his completion rate but he will win more SB’s than anyone else.
Wins is a team stat, with a 53 man roster teams can win with a bad QB. Just ask the 2000 Ravens whose QB is still considered the worst to ever touch a Lombardi. The reason Brady is highly considered is because he completes passes and those complete passes help his team put up gaudy statistics and win games including championships (though not more than anybody else, he’s not even tied for first).