I'm having a difficult time locating an English version voice credit for Gywn. The Japanese one was no great effort, but after checking the credits on the Google cache of the WD site and searching the files on the game disks (in hopes it would be in the outtake images), all I know is that it seems to be uncredited. Was it a WD staff member, then...?
Hal Delahousse, or something like that? Maybe, but he does seem to have been left out of the credits for some reason. I wonder if anything is mentioned on the Making Of disc.
I know Vic's had some uncredited voice parts over the years, but this doens't seem likely to be one.