Since Konami Kukeiha Club is written in the package (front, obi...) I think they only specified KKC as arranger to clarify that the arrangers are people from KKC as well, since composition is a given.
I'd link all four sound people, as doesn't seem like we'll get definite proof Maezawa or Hashimoto didn't compose.
At times like this I kind of miss some sort of "maybe" check for artists tho.
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