No..basic time travel logic disagrees with you.

XD
Majora's Mask disagrees with you

True...but there is no evidence that supports against it either. Either way you still support a theory that is rife with time travel paradoxes. If the theory you support were true, then Link would have met himself in the MS chamber when he opened the DOT. The fact that he did not is enough proof that the theory I support is more probable anyway.

No ingame evidence supports that she went back to the Castle.
You can use the same logic that says it doesn't show the takeover in that you say she returns to the Castle.
However, it seems illogical to assume that she would return.
Buuuuuut whatever. XD

It means just that. It doesn't mean that he conquered Hyrule right then and there. When Link returns to being a child during the quest, there is nothing that indicates conquest or a political takeover of any kind going on in Castle Town or the rest of Hyrule. Therefore going by simple common sense, the attack was probably simply just thwarted. IN GAME evidence supports my claim.

So, if Ganon betrayed the King, what does that mean happened?

It only gives evidence that Zelda and Impa fled because Ganon betrayed the King. There is still no evidence that Ganon fully conquered Hyrule before Link pulled the MS anyway. And there is still no proof that Zelda eventually returning to the castle is impossible.

So in other words you still support a theory that is rife with time travel paradoxes anyway. Just get over it and accept that Link probably returned to the exact same time that he was returned to during the quest.

Psst.

Remember that debate we had that one time about whether or not Zelda returned to Hyrule Castle? XD;

This is evidence that she didn't.