This never hurts!
A pseudo-release is just that, not a 'proper' release
Your own translation, the most widely known fan translation, it's all valid - official is obviously best, but otherwise feel free to make do with what you can.
Putting lots of information and sources (or mentioning lack of sources) into the comments is great - then you can get stuck in and if a more experienced editor wants to change things later they have the tools to do so.
The spine is considered very high in order of precedence. Anything else on the release itself (eg cover, CD, etc) is up there as well, but Spine seems to be a good rule of thumb.
Often the cover/CD/spine will differ on the same release as well, so it's a judgement call sometimes...
A company website is unfortunately often not reliable. Amazon is at the very bottom of the accuracy pile
Thanks for your edits, and hopefully that helps!