I was talking about SR Cybele. You shouldn't be bringing Amaterasu just because she's SSR. If Wind had no access to B type debuff, then sure, but SR Cybele is 15%.
The question is, have you checked do you do more damage when SR Cybele deals notably more than Amaterasu, even though the rest of your team deals less?It specifically says that you do NOT, but please don't do that. That'd be a really, really bad idea.
EDIT: Thanks VeryVoodoo.