he dragged it out because he was afraid Gebbia would transfer.. when he thought the transfer window had closed, he announced his QB competition winner..I know for a fact that Gebbia and Martinez were taking equall reps with the number 1 offense with two weeks remaining in fall camp. He gave both a legit chance and decided AM was his best option at QB. The next day Gebbia made the choice to transfer. I'm not sure how you came to the conclusion that Frost ran off Gebbia.
just because he gave equal reps doesn't mean anything.. Frost knew who was going to play before spring ball.
Frost promised AM the job when he recruited him. That is how he got his commitment here.
Had Frost managed the Gebbia situation after spring ball and named Martinez the starter then, it might have led to Gebbia staying, but the fact that Frost was playing him, made Gebbia's father come up with an alternate plan because at that point, they all knew it was a farce.