Basketball is a somewhat unique sport.
Teams do win championships. The teams that move the ball and work together, sometimes giving up their individual goals or accepting reduced individual roles, are the ones that win.
But talent ultimately wins out. With the nature of seven-game series, the more talented, together team finds a way to win.
The trick of rebuilding is accumulating the right talent and building around the right star. The popular thing to do these days is build through the draft, finding stars to nurture through the NBA Draft and keeping that player locked in from beginning to tumultuous end.