I don't see what's stopping Yoshiaki Kashima from being the composer. I mean, on a game I found out the composer for (I think Whip Rush?), the composer (Toshiko Tasaki) had three different sound roles, with three different aliases. So just him being "Sound Arrange", could also mean he did everything new.
I don't think he lists Mercs on his archived site though. Hmm
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