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. . . in the NBA is far more constrained than in MLB, where you work to build an organization. The NBA has no organization. You simply cannot win without stars, big stars. Even model small-market or mid-market teams, eg, San Antonio (not just Duncan ut Duncan plus Robinson), can only thrive is they get lucky and get those stars through the draft. One player can turn a team around.
In that sense, you can re-make a horrible team, but only if you get really lucky.