A 49ers loss allows the Saints to "essentially" control their own destiny for the playoffs

Me, too.
Here's a question, though -

In a 3-way tie scenario, if 1 of the 3 has the best conference record, and the remaining 2 have the same conference record, does the team with the best conference record advance, and the other 2 teams revert to a 2-way tiebreaker?
Or do all 3 teams go to the next step in the tiebreaker?
It would then go to the next tie breaker which is overall record vs common opponents ( for the two teams who
have the same conference record )