re: LSU will soar in the rankings this week.

quote:

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Whether Bama or LSU won that tiebreaker would come down to the combined SEC records of (TN and UK) v (Mizzu and Florida).

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This is incorrect. In a 3-way tie, as soon as one team has been eliminated (obviously OM as you explained) then it reverts to the 2-way tiebreaker and head-to-head would rule.
If LSU wins out they're going to the champ game.
If they beat Georgia (assuming they have a loss) then the SEC will be left out of the CFP for the first time ever.