Sorry for the delay! If it's the Tones she needs, which is what we're coming to understand, those are fine. If it's another character with an appable personality, then you'd need someone else to app them in.

To expand from our conversation over AIM, I'd like to thank you for your clarification on how Cure Rhythm's transformation would work. Kanade wouldn't be able to transform in-game without Hibiki present, and vice versa as both must be in the same dimension to transform.