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

What has to happen in Week 15 for the New Orleans Saints to regain the No. 1 seed in the NFC playoff race?
When the New Orleans Saints lost to the San Francisco 49ers in a shootout last Sunday, they also lost the NFC No. 1 seed as well. In the NFC playoffs, only the No. 1 and No. 2 seeds get a first-round bye, and that first-round bye could prove to be crucial to a Saints’ Super Bowl run.
They have already clinched their division and a playoff birth. The only question left up in the air is which seed they will receive.
For the New Orleans Saints to regain the No.1 seed, they obviously need to win out in Week 15 against the Colts, Week 16 against the Titans, and Week 17 against the Panthers. Three easy opponents for the Saints to beat.
Meanwhile, the 49ers, Packers, and Seahawks don’t have as easy of a remaining schedule.
Obviously, the goal is to get back into the No. 1 overall spot in the NFC to receive home-field advantage throughout all the playoffs AND a first-round bye. However, for that to happen in Week 15, these three outcomes need to become realities.