VICL-61551: GANKUTSUOU ORIGINAL SOUND TRACK

[AcidBeast]

So, the booklet credits are a bit disputable.
On page 1 it says tracks 1, 3, 4, 6~9, 11, 12, 16~18 are composed and arranged by reiji kitazato (teng), but the last page also states that those tracks are "written and recorded by koji kasamatsu & reiji kitazato (teng)".
Koji Kasamatsu is credited as sound designer and sound architect on this album. Looking at some of his other involvements (other), he either takes the role of the sound designer/recorder or/and that of a remixer, but rarely as a composer. Since it says "recorded & written" it could also mean that Kasamatsu recorded the pieces and Kitazato wrote them.
So, should he stay credited or be removed from the composer field?

EDIT: After taking a look at the audio drama (which uses the bgm) staff credits, it seems that Koji Kasamatsu only worked as sound designer and teng is the composer & arranger.

[CHz]

"teng" appears to be a unit of Koji Kasamatsu and Reiji Kitazato, not just an alias for Kitazato, which would explain the "written and recorded by koji kasamatsu & reiji kitazato (teng)" credit. Both of them are credited for "additional music" in the ED of Gankutsuou.