Lions could be 13-3 if they win out.
Seahawks 13-3 if they lose two (one being the Whiners) and beat NO.
*NO 13-3 if they win out (aside from @SEA).
*SF 13-3 if they win out.
*NO and SF both play each other.
Not sure who the tiebreaker would go to in that scenario.
http://www.nfl.com/standings/tiebreakingprocedures
According to #1, SEA would have beaten NO. NO and SF play each other. If SF beats NO, they we have tiebreaker over SF from common opponents. Then we'd have tiebreaker over Lions for common games (Lions lost to Arizona). If NO wins against SF, I'm not sure if #1 is factored in with Lions not playing NO and SEA.
Seems like NO and Lions would get it according to #2 since they'd be undefeated in division, and SEA would have lost 1 to SF (assuming they end up 13-3 or 12-4 losing to NO).
Realistically, Detroit loses a few. They are not "great." Detroit could screw us in the tie-breaking would we drop two more games.
Also, losing to NO would throw a wrench into it as well.
Either way, we control our own destiny.