I don't recall us ever seeing Skyloft after the defeat of Demise. I'm almost done with Hero Mode and will be able to see the ending again, but I'm pretty sure we never see Skyloft again. For all we know it came crashing down after the defeat of Demise just like the Goddess Statue did previously.The powers that were keeping Skyloft afloat were still very much in tact at the end of the game despite Skyloft no longer being needed and despite it being more beneficial if those humans were on the ground.
Such as? The fact that they're both in the sky isn't much of a connection.There are plenty of connections.
You know what else is flying? The Isle of Songs. And Fun Fun Island. Why aren't you trying to claim that either of those things turn into the City in the Sky?Even if you don't believe the theory there is one, they're both flying.
Skyloft and the City in the Sky are extremely different. Architecture-wise, they're not even slightly similar. Skyloft has a LOT of water, yet none is to be seen in the City in the Sky. Skyloft is one huge piece of land, the City in the Sky is a multitude of tiny, tiny islands.
Really, it would make much more sense to insist that any of those other clusters of islands are turned into the City in the Sky by the Oocca.