User blog comment:LuffyPirateKing/Luffy and his belly/@comment-1595565-20121021173205/@comment-5601098-20121022150004

Well we don't know if teach ate the Yami Yami no mi.Just think its the only fruit that was seen before being eaten and not being eaten"on screen".Maybe teach had another devil fruit powers which allows him to take the powers of other devil fruit users if he kills them