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I won't be able to defeat the reflecting boss without Ayano; there's no point. If I understand the idea correctly, I've been understanding it more or less correctly up to this point. And even if I weren't here, you'd still have to get that sphere. Because even the toughest sphere guardian is unlikely to be worse than Reisen Udongein Inaba.
So, there's no point in splitting up. At least this way, I can provide some cover.
But I was thinking that maybe we could place transparent spheres on the pedestals instead of the regular ones and avoid fighting the guardians... But I doubt it, unfortunately.