In order to show his genuine friendship with Gatsby and the fact that he has now learned the truth about Gatsby, it was important for Nick to assume leadership.
Being his sole close friend and the only one who truly cared about him, Nick organized Gatsby's burial. Following Gatsby's passing, no one else expressed any interest in him.
Except for him, no one else would plan Gatsby's funeral or care about him. He contacted Daisy and several others, but received either a negligible or no response. He took charge and organized the funeral by himself.
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