Now, that basically leaves two options: a "dark interloper" or something completely new. I consider both of these options equally possible. However, I’m 99.99999...% on the “dark interloper” side. (I can’t say 100% because it hasn’t been confirmed.) I say this because of the evidence we’re given to support it. And here’s the thing: there’s nothing to contradict it. I’ll prove it. We know that the “dark interlopers” were part of a war for the Sacred Realm. Some people would say, “Well, that’s the war in Ocarina of Time’s back-story. The “Unifying War.” I say otherwise. Yes, the “Unifying War” was over gaining access to the Sacred Realm and the power held within it, just like the war mentioned by Lanayru in Twilight Princess. However, the Temple of Time had already been constructed before the “Unifying War.” Proof? Well, there’s a little story in Ocarina of Time that tells of a boy who’s mother was mortally wounded. This boy’s mother took him to the Great Deku Tree Kokiri Forest out of desperation. We know this child to be the Link of Ocarina of Time. Unless that Link lived a veeeeeeery long time and stayed a baby during it, the “Unifying War” has to be right before the events of Ocarina of Time.
Now, more about the Temple of Time itself. Rauru said, “We ancient Sages built the Temple of Time…” Ancient Sages. That means that the Temple of Time was built in ancient times, long before Ocarina of Time. Plus, we know that in the war mentioned in Twilight Princess, the Sacred Realm was open to where it could be accessed by anyone. The Temple of Time was built as a defense for the Sacred Realm with the Master Sword as the final barrier, as well as the key to opening the Sacred Realm itself. All that said, the “Unifying War” and the war in Twilight Princess’s back-story can’t be one-in-the-same. This leaves a perfect spot for the “dark interlopers” to come about in Skyward Sword, as it’s set before Ocarina of Time. And, with the “army of evil” mentioned and the fact that Skyloft is part of Hyrule, the war mentioned in Twilight Princess has a strong possibility of being in Skyward Sword’s back-story, if not still going on in-game. The “dark interlopers” being sealed at the end of the game would work perfectly, as well. Saying that, --kind of off topic, but it ties in -- what better time for the Temple of Time to be constructed than after the events of Skyward Sword? And wouldn’t it make sense for the Skyward Sword to become the Master Sword at that point? While that’s just speculation, it’s a good prediction. This is why I say that the “pale figure” is a “dark interloper,” if not their leader. Now, yes, I did say that I think it’s equally possible for the “pale figure” to be something entirely new, but that’s only because we don’t know what or who he is yet. All that said, there's really no possibility for this "pale figure" to be anything but a "dark interloper" or something entirely new. That's what I got.