As for the question, anything is possible, but often guys that are top tier picks that stay in school end up falling much further than if they would have come out originally. Perry Jones and own Sullinger are great examples of this. The extra year often lets flaws get discovered and those guys get nitpicked a great deal more (after all they have 2 years instead of 1). Now if Brown stayed and set the world on fire, then it might not have done much to his draft stock, but that is the big risk there.