Isn't that basically the same thing?
Yes, Aeris was the only one in the party who could summon Holy, that is why she got stabbed. 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. 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.
I can't imagine Cid summoning Holy.