This one can be considered a little tricky.

When Kyrie Irving surprisingly requested a trade from Cleveland (to get away from LeBron, let's be honest!), Boston arguably stole him in the deal, considering that the best player that they gave up, Isaiah Thomas, was never the same after that hip injury that took him out during the previous playoffs.  Irving wanted to prove he could lead a powerhouse team, and he did…sort of.

Dennis Johnson played the last half of his career (seven years) with the Boston Celtics after already playing in four All-Star Games and winning the NBA Championship in 1979 with the Seattle SuperSonics.  "D.J." was already one of the best defensive guards, and as a Celtic, he would continue to provide that with four All-Defensive Selections (one First Team and three Second Teams).  Johnson was scoring as much as he had before, but with Boston, he had switched to Point Guard, and it showed in higher assist numbers than the Shooting Guard ever had before.

Paul Silas was with the Boston Celtics for four seasons, directly after he was chosen for his first All-Star Game with the Phoenix Suns.  Silas was much happier in Boston, and every season he donned the green, he averaged a double-double, posting 11.5 Points and 12.3 Rebounds per Game as a Celtic.  The Power Forward wasn't a great shooter, but his pay was based on his rebounding prowess, and Silas was damned good at it.  He finished in the top 13 in Rebounds per Game every year he played in Boston, and in three seasons, he was named an All-Defensive Selection.  Silas was chosen for the All-Star Game in 1975, and, most importantly, his defensive skills were a tremendous asset to Boston, helping the team win the 1974 and 1976 NBA Championships.

Yes, we know that Thomas's stay in Boston lasted only two years and change, but he was on fire, especially in his last year, and was the man who carried Boston further than they had any right to be at the time.