After Brady shared starting duties at Michigan with Drew Henson, most scouts didn't believe he had the physical tools to be a starting NFL quarterback. He was too thin, ran a slow 40 at the combine and didn't have a strong enough arm. The Patriots saw some upside, but even they had to be surprised at how successful Brady was after taking over for an injured Drew Bledsoe in 2001. Brady became the first QB to start and win three Super Bowls before age 28.