Nah, it’s dumb. You’ll never convince me the 3rd possession is the one you play for. You control the game by deferring. You know exactly what you have to do with the 2nd possession.
And if you have the nuts to do it, no team that gets it first is going to go for 2 after an TD. Ever. You can be down 7, and go for the win by going for 2. It requires a boatload of testes, but you have that in your pocket.
Shanahan didn’t even get to the 3rd possession. That’s why you don’t play for the 3rd possession. You play for a possession that you never see? Dumbest move in SB history. The excuse of the “3rd possession”. Dumb.