You hire a coach and give him a multi year contract, trade up to 1st overall with 4 potential QBs to chose from, it only makes logical sense that he would get to select his QB. He's going to be running the team for at least 3 years, hypothetically. Why wouldn't he get his guy?
Bryce was Tepper's choice, not Frank's. You knew Frank didn't want to work for Dave after the draft. Can't work for a guy you can't trust and Dave and Scott lied to him. His face told the story then, it showed during the season, and he completely gave up when he couldn't fix Bryce over the weekend.