I don't think the 2016 PSU precedent will carry over here. If TCU winds up dropping a game, LSU winning the SEC in Atlanta could very well give a shot at 3 teams making playoff.
The main thing for LSU's chances is if they get to #6 Tuesday after beating Bama. If they somehow go into Atlanta as a top 6 team in the CFP, a win over #1 UGA would have to include them in the playoff. I don't think a 12-1 Clemson, 12-1 Oregon, or 12-1 TCU would get in over an 11-2 LSU with 3 top ten wins in their final 7 games.
I think UGA is a lock for the playoff regardless of Atlanta... I think Tennessee is a lock at 11-1 as no initial #1 ranked team has missed the playoff with 0/1 losses. I think Ohio State/Michigan winner is the 3rd lock. The 4th spot could come down to committee choosing between 12-1 Clemson, 12-1 Oregon/USC, 12-1 TCU, 11-2 LSU...
Since the SEC title would likely be only championship game with 2 top 6 ranked teams, I don't see how you can leave out #6 "because of 2 losses" if they beat #1 team.....
And in that scenario, we would have a blowout win over that 11-2 team. All hell would break loose if LSU goes 11-2. You would have debates worse than a presidential debate happening all over the football world.