I'm not disagreeing that she was the only one who could do it then. What I am disagreeing with is the concept that it was somehow limited to just being cast by the cetra, instead of anyone with the knowledge and will to cast it.
Well, it kind of fell into the water and sank in the ancient city, so that's kind of not an option.If Sephiroth was really worried about the White Materia after he killed her, he just would have had Cloud bring it to him along with the Black Materia.
Well, Aerith's will was the one that called forth Holy, same as Sephy's called forth Meteor. I don't see why that means her connection was a necessity for it to be cast, though.Also, in the ending, Marlene says she can sense Aeris when Holy arrives, which I took to as it was Aeris personal connection with the planet that allowed Holy to be summoned.
He doesn't seem the type to cast it either, especially based on his speech before the crater, but I do not believe it's impossible for him to cast it, since I don't think the cetra are complete smegheads who would be so foolish as to put an 'us only' limiter on the counter device to a horrible destructive force that could inflict massive damage on the planet they tended and venerated.I can't imagine Cid summoning Holy.