In sports, including the 30 NBA teams, the concept of team "continuity" can be a funny thing.
On one hand, bringing back a bunch of players for continuity's sake isn't necessarily a winning formula. But, using an extreme example, think about a winless squad that returns the same roster: The general manager probably won't draw rave reviews, but we know that constant churn -- among players, coaches, front-office staff and other key figures -- is why losing teams often stay down.
My previous research has shown that, even after controlling for how good or bad a team was, franchises with more turmoil around important roles tend to do worse going forward.