Board Thread:General Discussion/@comment-4224349-20141204232756/@comment-24990623-20141215235208

TheBoomerCow wrote: Don't worry, I understand that.

However, it's something we as the viewers know will pop up again. It demystifies Rose a little as a character and is, once again, plot important.

Same with, say, Sugilite. We got shown this awesome uncontrollable beast early on. A character like this will be used in another episode because of a big baddie or something.

Alexandrite and Opal too.

You should read To Kill a Mockingbird. It had innovations in things such as world building, where the Ewell family was introduced and became very plot important later.

To add on a little, all of the episodes before Mirror Gem were introductory episodes, showing how everything and everybody worked before the true start of the series, where those concepts and characters are put into action.