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Rondo will need to increase his scoring and attack rate in order for the Celtics to remain a top-tier team in the NBA. Most teams back off and give him a lot of time and space to see the floor. If he uses that space to look for his shot a little bit more, it would put pressure on the opposing defense to respect him.
By doing so, more players would be open, especially through his swift penetration to the basket. At this point for the Celtics, they don't have a player who can get them 25+ points per night besides Paul Pierce at times.
Most teams that go the furthest in the playoffs have a dynamic scoring threat, like Oklahoma City and Miami. For that reason, the Celtics have to beat other teams by using smarter, veteran-like and balanced play, which is similar to the San Antonio Spurs style of play.