So you pick up a pandaren as your example, to say that Alleria void elf followers could magically revert into High Elves? Ok.
Also Void elves were blood elves that were exiled from Silvermoon because they researched the void and they had no blue eyes and were not the pure high elves.
They can't magically revert into High Elfs just to look like Alleria. Makes no sense.