This feels somewhat similar to the motivation behind the “Crediting a remix album” thread. My interpretation is that @IvanDobsky’s (and maybe also @chiark’s) concern comes down to (quoting the new Remixes and mashups guidelines) a “release that was created without any participation from the credited artist” being credited to the composer.
I share this concern. I don’t know if it’d even be possible to fix this in the UI without schema changes, but it feels weird to me that the release groups listed first for Howard Shore are a bunch of re-recordings that he doesn’t even list in his official discography at howardshore.com » Discography/Filmography.