For the Miami Heat, only a change in the math will alter a season that again has Erik Spoelstra’s team two games below .500. When Tyler Herro was out with his sprained left ankle, the Heat went 3-5. With Jimmy Butler out with his sore right knee these past two weeks, the Heat have gone 3-4. Now, with Butler scheduled to return to the team Thursday and expected for Friday night’s rematch against the Boston Celtics at TD Garden, the hope is for a change in the team’s overall equation. “He’s one of the best players in the league.