Coaches had to convince him to take even just a week off from working out last summer. I think you are assuming a whole lot in your post based on not a whole lot. I am sure he can improve his game, but so can everybody. I think you need to be more careful in how you assess people's work ethic and effort because you don't have a whole lot of basis. You really have no idea how much he prepares and how much effort he gives on the field.
Based on what players and coaches have said, I am pretty sure Bronson gives 100% on the field and works very hard in preparing.