Uhm... I apologize for cutting in this Fan Fest unasked, but this isn't actually true, the substitution list that is in the Worlds Entries list is sorted by the alphabet order of the skaters' last names.
You can see the Japanese Men Worlds team is listed in order of
Kagiyama (Yuma) -
Miura (Kao) -
Uno (Shoma), when Shoma should be the first entry after Yuzuru's withdrawal, based on their placements at Nationals that determined the Worlds spot. So the substitute list follows the same order:
Miyake (Sena) -
Tomono (Kazuki). But I'm sure Kazuki is still the second alternate after Kao and will be called up if needed.
You can also compare it with the Women's: the Japanese substitutes are listed in order of
Matsuike (Rino) -
Mihara (Mai) -
Miyahara (Satoko), when the first alternate is Mai and Rino is the third alternate.
Hopefully this clears up any confusion- there's no news of Kazuki being shuffled down the alternate list