Here's my crack theory:
The "person" who Kaito was talking about was Meroron, which is why for story reasons he's been absent while she's been around since they would have recognised each other, it's also why she conveniently got bumped away without him seeing her this episode.
However, Meroron no longer recognises him now when she sees him, because he's what she gave up to become Zukyoon.

When Uta asked why Purirun and Meroron look older as Cures, it's because they ARE older, they just naturally act immature as fairies.