User blog comment:KnocknickKnock/9 gates + master of the celestial realm/@comment-2.83.198.8-20131212210042/@comment-7418318-20131214220801

Here you go again jumping to conclusions.

The only key that was ever said to have multiple issures is Canis Minor. If you are so convinced that I'm wrong, please give me the chapter and page number or episode number and minute where it's stated that all silver keys have multiple versions to proof me wrong.

And while the Spirit King did say "We who are bound by keys" that might just have been his odd way of speaking, rather than him being literal. After all he constantly refered to Loke as "My old friend" even after sentencing him to a slow and lingering death over a case that fell into a gray area that would easily have justified not giving the death sentence.

For all we know his key might also be all twelve golden keys put together and the reason no mortal was ever able to summon him is because nobody ever managed to gather all twelve keys in recorded history.