Who’s stepped up most in the absence of the Sixers’ stars this season?

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Despite Joel Embiid, James Harden and Tyrese Maxey having missed a combined 45 games, the Philadelphia 76ers find themselves fourth in the East at 25-15. They’re just a game behind the third-seeded Milwaukee Bucks and two games behind the second-seeded Brooklyn Nets. So, who deserves the most credit for helping Philadelphia weather the various, prolonged absences of its stars?