I've always been of the opinion that Millsap was given the starter nod over Favors because of his contract situation. Corbin loves vets, and I'm sure he loves Millsap for obvious reasons. I think Ty still gave Sap the benefit of the doubt, even though Favors turned on last season, to give him the best chance at a payday. Ty hinted towards it at the end of last season.
I don't think he'll get the same treatment again if Kanter out plays him, and I think Sap knows this. On top of that, there was supposed friction between Ty and Paul last season.
I don't see him coming back.