I can find no problems with the GR2 files.
Many are just copies of the same file.
(A bit of a waste)
The dds files are fine.
I'm still not sure of the Shaders and such.
That's beyond my learnings at this time.
I seem to recall the same issue in SH4 a ways back?

I never had much time to mess with SH4 so I may be wrong.
But this does ring a bell for some reason.