I'm not a Sanchize fan but you can't pull him whenever he has a few bad drives. You have to let him know you'll stick with him. It's why it was so dumb to bring Tebow there. He's toxic unless an established guy is in front of him
They could have done something similar to the first game and hope they'd get better yardage and possibly let Tebow throw once or twice. Instead they pretty much abandoned it.