This is Moriarty.
He killed himself two years ago.
But then it turned out he might not have.
Conspiracy 1: He did actually kiss Sherlock on the rooftop.
Conspiracy 2: He is still dead and it is a smoke screen by Mary.
Conspiracy 3: Derren Brown really was at the scene.
Conspiracy 4: Mycroft kidnapped Moriarty and forced him to work for him.
Conspiracy 5: He was working with Magnusson and neither is dead.
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