It possible, but I think this is more along the lines what happened to Boris and Tserk, given there was chaotic magic involved. Well Ami might be able to split them with magic now, back then they could only stop the progression that caused them to merge, it took the light priests at a temple to separate them. I think the more likely outcome of removing Metalia's magic, is she just going to get all the hungry Youma going to the only nearby source, her, and end up her minions. Then the Light priest dwarfs will start to cure them.



I fully expect some, like Mengolin are going to refuse to be cured and Ami going to have a big struggle around it. Does she force Mengolin to let the Dwarfen Light Priests cure him, even though he does not want it, or does she allow him to remain as he is. Ami knows it effected his mind, and she can be fairly certain Mengolin before this happened would not want it, but is it right to undo it and return him to prior self, or leave him as he wants to be right now. I expect the way the light gods would resolve it themselves, would be to somehow restore just his mind back to how it was before, then ask him, do you want to remain as you are now, or as you were before.



Ami does not have that benefit, and would likely have to choose one way or the other. If she refuses, he stay on her side, if she allows them to, he likely end up her foe again. Given Ami's personality, the Senshi actions in canon and so on, I fully expect Ami would settle on forcing them to return back to how they were before they were effected by the water. But I do also see her allowing people that want to be turned by it, that are not already, to do so.



With how busy the priests would be, I fully expect animals that turned, like the cat, will just remain as such in Ami's employ.