Nice, nice. But I still have a different opinion:

Why did the Aeris's ghost appear before her death (on disk 1)?

a) That part is ONLY glitched. Her ghost appearing after her death is not glitched as it's intended. When SE added the code, it was intended but apparently the code actually worked on all disks (supposed to be disk 4 only), counting as a glitch. It was intended, but her appearing before her death is the only thing that is glitched.

b) Some sort of premonition. Cloud, Aeris and Zack are related. Cloud then acknowledged that Aeris will die sooner when premonition occured, even though he hasn't done anything about it to stop Aeris from dying. Now in AC, as you see, he always ask for forgivenesses with his full desires, I wonder why. I mean, after her death in FF7. Time passed by (2 yrs) and yet Cloud still ask for forgivenesses.

c) Not intended, it was a glitch.. blah blah.

I'd choose between A and B, not C because it doesn't make sense. Many other things (if not, 98%) are perfect flow'd in the game, why only apart from the Aeris's ghost? Her ghost being a glitch is very hard to believe. It actually requires a NEW programming code for her to appear/disappear.

There are evidences to back it up that it wasn't a glitch. I can assume say that because there is no evidence that it was 100% glitched.

I doubt SE will enlighten us for a while because they want us to keep enjoying debate and serects, and those feelings for the replay value. I mean if they have enlightened us, next day we will forget about FF7.

I really can't wait to see the remake version (I hope that will happen) anyway.