I've said it many times; I have to ensure Raffy gets up in the first inning. For modern Red Sox starting rotations, first-strike instant leads are too important to not try for every game.
As for Casas, with his keen eye and how he works the count, I can envision some modern manager trying him as a Schwarber-type leadoff batter. Personally, I'd prefer another OBP man in front of him, to optimize Tris' run-producing potential.