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So in the end J says that its a pact before disappearing when Mako promised to say his name for eternity. I wonder if its a real pact just like the one Mako has with D and S. For Mako to get the end to his loneliness, he has to break the pact by not calling Jonathan anymore.
But because of Mako's obsession with J, he will not and will continue to suffer for a long time and disappear the hard and long way.
What a beautiful way to show how deep inside Makoto is still under J and was only fooling himself the entire time.