User blog comment:Derpyunikitty/Katie was robbed/@comment-34183063-20180731132557/@comment-11883116-20180731171828

Agreed. Katie and Sadie would be a perfect choice for RR. No idea why they weren't included.

Because Leonard fits the role of the first boot perfectly. Also because he (and Tammy) replaced a team of magicians so that the creaters could save some money on the new designs and new voice actors of the first eliminated team.