Here is a clip from Japan’s Official Gazette.
Kakuryu is officially a citizen of Japan.
A lot has been riding on this citizenship. With his physical fitness deteriorating, there was a real danger he would be forced to retire without a citizenship. This would have meant he could not stay as an oyakata, as the rules of the NSK only allow Japanese citizens to be toshiyori (oyakata).
This would have been regrettable even without the background noise, as Kakuryu has a good reputation for leadership by example, and his presence in the sumo world would have been missed. But in his case, there was also the issue of the dying wish of his master, the late Izutsu oyakata, who wanted him to take over the heya.
The heya no longer exists as such, and even the building where it was located is currently being demolished. But now that he has earned his citizenship, he will be able to take the Izutsu name (there is some evidence that the former Toyonoshima is only holding it temporarily), and establish the heya again – as has already happened in the history of that heya. I’m sure this will make the Widow Fukuzono happy, and probably the late master’s brother, Shikoroyama oyakata, as well.
And of course, every sumo fan who has come to love and respect Kakuryu.