Host countries’ picks are the lone exception to the traditional champion’s right to pick their assignments, so Nathan cannot take NHK over Yuzuru unless Hanyu and the JSF agree.
Ok, I wasn't sure about this, so thank you for correcting me!
I'll stick with the same predictions. If Yuzuru gets NHK then I find it unlikely that Shoma would be there too, therefore he would likely get the earlier events whilst having to avoid Boyang and Mikhail.