He was one of the only ones not present when the tengu appeared and he might have wanted to take the Emperor's Cup all for himself, so that Raden would forfeit and he would probably want to end his sumo career with a bang.
He might have wanted to win the Emperor's Cup, so that he could make Kanjibono forfeit the tournament to him.
He really did not seem ready to take Kanjibono's place on the sumo mat once Kanjibono used the golden scissors to separate himself from his Oicho-Mage, or top-knot, and became sumo no more.
According to the referee, Ama Mara, she might have liked to see the tournament cancelled, just so that she might have promoted more and profited more later.
Tommy Yamaguchi One of Tommy Yamaguchi's former janitor colleagues as the Tengu Tommy Yamaguchi's unseen other janitor colleagues
Yamaguchi was afraid to take Kanjibono's place on the sumo mat once he retired, so he stole the golden scissors to prevent Kanjibono's retirement and the Emperor's cup to confuse everyone.