Unfortunately, I suspect that Aladdin is really Aladdin (though the idea of him being Jafar is appealing.) There is something just a little bit awkward about this SB version of Aladdin, and I can’t put my finger on it — so maybe.
If that’s a plot hole, it’s a massive one (not just a continuity problem or retcon, but actually a total worldbuilding screw up). Surely, someone in the writers’ room would have picked up on it.
What if the shears actually don’t do anything, just like the Diamond in the Rough I don’t think did anything — it was just there to reveal Aladdin’s saviorhood. Maybe using the shears doesn’t actually do anything, but simply helps the person channel their wish to be rid of their powers? In that case it wouldn’t work on anyone but Emma, and Emma would have to use them herself. Dunno.