By Matt Audilet Oklahoma State will roll out its third starting quarterback of the year on Saturday. With starting quarterback Spencer Sanders out for the second straight game, Gunnar Gundy — the son of Cowboys head coach Mike Gundy — is expected to make his first career start. Garret Rangel made the start in a loss to Kansas last weekend and threw three interceptions. Gundy and Rangel split first team reps during practice leading up to last week’s game, but Rangel ultimately earned the start. This week, the QB1 job will go to the coach’s son. Gundy, a redshirt freshman, has logged 144 passing…