I'm thinking about this hairpull Onosho pulled. I have the suspicion he did this intentionally to allow Hoshoryu to win one and remain in position as sekiwake or at least to not break the winning streak. The yusho already was gone for Onosho, so not much depended on the last win anymore. Were he told to disqualify himself, or did he do it on his volition? Was it premeditated, or suddenly thought no way Hoshoryu could win this and felt generous?
The sekiwake suffered an ankle injury as previously noted, against Wakamotoharu, and he lost 4 matches out of 5 after that. He could have had a way better run than that.