I think Sams will see the field for plenty of snaps, even if Waters remains the starter. Makes sense to do Wildcat stuff with Sams as the guy for 5-8 snaps (at least) per game, plus some packages with Sams and Waters on the field at the same time.
And I don't have a Dunn/Ell feel about this situation because its entirely different. Dunn was never part of any QB run game/read option system at his JUCO and was just a passer. He didn't do it a bunch, but Waters ran read option stuff plenty in JUCO.