When it comes to the NBA, it is always important to remember how little we know, and how much can change over the course of a season.

A year ago at this time, nobody knew that Luka Doncic would be on the Lakers, Jimmy Butler would join the Warriors and that a Timberwolves team with Julius Randle and Donte DiVincenzo instead of Karl-Anthony Towns would beat them both on their way to reprising their appearance in the Western Conference Finals.

A year ago, the Celtics were a budding dynasty. Today, after the recent torn Achilles that is likely to sideline star Jason Tatum for most of next season, plus the onerous penalties the NBA’s new collective bargaining agreement imposes on teams that chronically spend well beyond the salary cap, the future of the Celtics and their core personnel is ve

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