Dapeng

Taiho was much less successful as oyakata than as rikishi. Futabayama was the only exception.

Kisenosato fought Hakuho 60 times to win 16, 26.7%, on the other hand, Harumafuji fought Hakuho 57 times to win 21, 36.8%. Kisenosato deserved the rope, but a weaker yokozuna than Harumafuji, not to say that his direct collision with Harumafuji was 24:37.

From now on the yushos will be mostly grabbed by the top two and we won't see 12-win yusho as often as in the recent 3-4 years, not to say hiramaku yusho.

With two yokozuna on board esp one of them being native Japanese, the NSK won't have enough motivation to promote him, not to say that he's unlikely to break through the two layers of yokozuna walls in front of him.

One rikishi's non-historical win becomes a historical loss of another rikishi ...

There are also other requirements such as "outstanding strength". Losing 4 bouts in one basho can't be considered "outstanding".

It seems no one who had regularly yushoed had ever failed to reach yokozuna position and only yokozuna was seen to alternate between yusho and non-yusho.

I don't think a 11-4-Y will lead to promotion but a 13-2-D or -J will. It depends on how he manages the pressure.

I think Hoshoryu was promoted because of his impressive performance on day-15. Still, some people considered his 12-3 yusho being "monotarinayi" (not good enough).

A 12-3 yusho next basho will probably not enough for Onosato to be promoted, but a 13-2 yusho will.

Would be interesting to see. Anyway, we've saw once-in-a hundred years yusho.

I think it's possible to have only one ozeki and no yokozuna. For example if Hoshoryu retires (although unlikely) and Kotozakura gets demoted after this coming spring basho?

Had M19 ever appeared?

It's said that when Asashoryu saw Hoshoryu beaten by Kotozakura on the last day of last year's Nov. basho, he said that the Mongolian-born rikishies' dominance of sumo that he started was effectively ended. Now we can say that the Mongolian dominance will be continued for a few more years, at least.

Sure, 13-2 is a yusho score these days. In recent 3 years, more than half of the yushos were 12-3 or worse. On average, almost 2 wins less than the 20-years' long Asa-Haku era. Look at Terunofuji's 10 yushos: 5 were 12-3. On the other hand, Hakuho only had 1 yusho of 12-3, out of his 45 career yushos.