One thing's for sure, Danny Ainge hit a home run when he lured Brad Stevens away from Butler 4 years ago. The NBA is a player-driven league, but a good coach still makes a difference and Brad Stevens is one of the best, if not THE best coaches in the league right now. He is good at every single facet of coaching: Training, managing egos, preparation and game planning, conditioning, making adjustements during the game, choosing the right lineup, and play calling. His teams have exceeded expectations every year he he's been coach. You keep this man under contract as long as you possibly can, if you're the Celtics.