Brady is smart enough to know when he's even a little woozy and should take himself out. But I know him well enough to imagine his thought process: It was hard for him to get on the field until the final two of his five years at Michigan, he was an overlooked sixth-round draft pick despite a 20-5 career in college and although he's won a record five Super Bowls, he never wants to provide Jimmy Garoppolo an opportunity to give Bill Belichick a reason to replace him.