Why FTs are key to a Butler breakout

After second-year swingman Jimmy Butler's statement against the Miami Heat in the 2013 playoffs -- when he averaged 15.6 PPG, 6.4 RPG, 1.6 3-PPG, 1.6 SPG, 43.1 FG% and 95.2 FT% -- the Chicago Bulls cleared the starting two-guard role for him by letting Richard Hamilton and Marco Belinelli walk. Kirk Hinrich is there, should Butler falter, but the job is his for the taking. What can we expect from him statistically, though?