What needs to happen Sunday for New Orleans Saints to regain No. 1 seed?

Chicago Bears beat Green Bay Packers
This one would be another big upset in terms of the actual teams.
The Chicago Bears and Green Bay Packers are long-time rivals and each is looking to extend another win on the other. That is good for the Saints as the Bears will go all out, but it is also bad because the Packers will go out too and the Packers are the better team.
However, there have been flashes of David Mongomery and Michell Trubisky where they look like they can overcome anyone. The Bears will need Montgomery to rush for at least 80-100 yards. We will also need Trubisdy to act like the same quarterback he was on December 5th of this year.
Tonight Mitchell Trubisky of the @ChicagoBears became the first QB in NFL history to ...
— Stats By STATS (@StatsBySTATS) December 6, 2019
Complete 70.0+ pct of his passes on 30+ attempts
Throw 3+ TD passes
Rush for 50+ yards
Rush for a TD
... all in the same game.#Bears100
The Bears have the downside of being on the road and having to go to Green Bay, but hopefully, their fans travel well enough to take away a little of the home-field advantage. There is a strong possibility here that the Bears could come out on top and that would be the best win scenario for the New Orleans Saints as they are currently the No. 2 seed in the NFC.
The ESPN Power Index has the current teams at 64.7% win percentage for the Packers and 35.0% for a Bears victory.