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

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 )
Is that how it works?
So if 2 teams are tied with the best conference record of the 3, the 3rd team is eliminated?
Sorry to ask another question.
No need to respond.
Thanks for your input.