Witch do you think restored sora's heart Aqua's magic or Kairi's heart? if it's kairi then she'll play a important role in restoring some of the bodys of certain character like Vanitas Xion & ME or even restoring the heartless it may even give her some good ass character development. But if it's Aqua's magic the that piece of jewelry may play a bigger role than just sending kairi to DI.