The Boston Celtics greatly exceeded expectations last season, surging to the NBA Finals after floundering around .500 until January. But because they didn't end the season as champions, Marcus Smart has still spent time wondering why they fell short to the Golden State Warriors in six games. Smart's answer: a lack of depth that placed too much of a burden on the starters to carry the team down the stretch and into the postseason. ** Celtics Talk: No Carmelo interest for the Celtics?...