Look, it just sometimes takes time to sort some of these things out. I wouldn't worry a lot. @Corainn, if you are quite sure that nothing currently within language ais is actually Amis, then we could outright move everything from ais to szy. Otherwise, the thing to do is to copy everything from ais to szy, and worry about the disposition of ais later.
@Amire80, I can assure you that (a) szy is appropriate for Sakizaya, (b) pretty much everything that had been put previously into ais is really Sakizaya (I'll find the rather robust discussion history if you like), and (c) ais for "Nataoran" has been deprecated in favor of including Nataoran within the rest of Amis (ami). So please help us move this along. Thanks.
@StevenJ81: Great to hear that and thanks for the reply! Yes, there are no overlaps between amis and szy(ais), I‘m very sure. If something could be done by our side, please let me know.