When you go to the Aliases tab for an artist, you are presented with a list of artist credits with the text (emphasis added) "This is a list of all the different ways [so and so] is credited in the database."

However this statement is not generally true, because it appears that credits used on relationships are not shown in the list.  You have to go to the relationships tab to see those.

For a specific example, see https://musicbrainz.org/artist/4f80908b-449c-47aa-be32-fecaeffdb7f2/aliases

I'd expect to see Kouichi Makai, Koichi Makai and Koichi MAKAI to appear in the list of "all the different ways MAKAI is credited in the database" as those are used variously on composition relationships for this artist, but these names are presently not listed.