We cannot say that this view has well accepted as a theory because it lacks concrete evidence, but this view has often been adopted in fictions, etc. in accordance with the theory for reasoning 'Doubt the person who obtained the largest advantage.'
物証に欠くため学説としては定着しているとは言いがたいが、「もっとも利益をえた者を疑え」という推理のセオリーにより、フィクション等で採用される事が多い説。