Dozier’s success is tied to hitting homers, which is less helpful hitting behind the worst hitters than the best. Even when he’s going great, it’s not a good spot for him. I would absolutely say Mauer is a better option to lead off, and to be perfectly honest, I’d put Escobar, Kepler, or even Grossman (assuming he’s going to play every day) there, and let Dozier hit his homers/popouts from the 3 hole.