Tommy said this yesterday during the post-game show while talking to Kyle Draper. Tommy said that Stevens has been preaching to push the ball up all year. Draper asked him what does he do if a player, in this case Rondo, doesn't listen. He responded "you sit him". To which Draper said, "but that's your captain, and Heinsohn responded "doesn't matter".
Heinsohn elaborated by stating that Rondo developed a lot of bad habits in playing for Doc because he grew to accustomed to walking the ball up the court. However, he spoke about how team was different and they ran plays in the halfcourt to perfection. This team can't execute like those veteran teams, so Rondo needs to get into sets faster to get shots in transition and have more time on the clock to run plays. His pounding of the ball was also criticized as another bad habit.