There are also many views that there was another ringleader (mastermind), it became one of the big questions in Japanese history. (For more information on individual views, refer to the section on "Fact about the Incident.")
さらには、他の首謀者（黒幕）がいたとする説も多数あり、日本史上の大きな謎のひとつとなっている（各説については変の要因を参照）。