With a POD no earlier than November 20 (the day the Army of Tennessee crossed the Tennessee River), what is the best case scenario for the Confederates in the Franklin-Nashville Campaign?
IOTL, they came close to scoring a major victory at Spring Hill, that might have snuffed out 20,000 Union soldiers. But it all came to grief at Franklin on November 30 and Nashville on December 15-16, where Hood's army was basically wrecked as a fighting force.
I don't think it's realistic for the Confederates to win the campaign, if that mean defeating Thomas and capturing Nashville. But I think it's clear that they could have done much better than they did.