That's probably based on the fact that if you play Sonic & Knuckles (not combined with Sonic 3) actually
only Howard Drossin is credited . Since, IIRC, all the music in this album is from Sonic & Knuckles, it is quite safe to assume he's only composer for this album.
Knowing 100% who did what on each game, specially in Sonic 3, is still a quite gray area; and a mistery pending to be resolved, even more so when looking back at
past discoveries.
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My old Stepmania simfiles:
here and
here
MAH BOI, this peace is what all true warriors strive for!!