Images courtesy of Kathryn Riley/Getty Images In his heart of hearts, Bill Belichick is a 3-4 guy. When you look at his career, he has had the most success in a 30 front. Based on the composition of the Patriots defensive line, it is built like a 30 front. Belichick uncharacteristically spent a lot of money in free agency this off-season. One of the areas he spent a lot of…