A while ago, Toki had a 10-5 as M4 and even became Komosubi for one basho. Judging by his previous bashos, he should have been happy even with a 7-8 or 6-9 from M4, yet he pulled off a 10-5, a rather sensational result for him from that position. Yet, it was all a fluke, a statistical aberration. Maybe he was in truly great shape that basho, maybe he was lucky, maybe (rather, surely) there were favorable psychological effects at work, and what not. With all those and many more, mostly minor, influences, if you take a large enough sample (many rikishi over many bashos), you will get all kinds of those aberrations.