Gobert w/ Kanter might be something in a couple years, but right now they are just too inexperienced.
Favors and Gobert would still need Gobert to improve a lot in terms of BBIQ, but would also need Favors to not be an at the rim player, which is where Favors gets like 90% of his points now.
If gobert develops though, spot minutes off the bench would just be stupid, and bringing a developed Favors or Kanter off the bench for spot minutes would be a waste of their value since that role is easily serviceable by a vet who will make a lot less. I think the perfect counterpart of a fully developed Gobert would be Kevin Love, or someone like him.