pilo said:
Watanabe said in an interview that he did the part where Mimora is skating but there are only three KAs on this episode (excluding the Studio Hibari credit) so this is likely all him. If I had to guess, he probably just fixated on the Mimora part in the interview because she's a cute little girl.

Anyways, this is probably the most fun I've seen Watanabe's animation get. Hope some other people enjoy this upload too.