Jayson Tatum seems to think he is Kobe Bryant, hogging the ball and leaning into ill-advised isolation play in the game’s waning seconds. But they have often come as the Duke alum has tried to play the hero, instead ending up the heel after not trusting his teammates and blowing close games. This lingering wart could cost the Celtics (and Tatum) a title again, and it has played a part in doing so