Who is Blur? (Theory)

The title doesn't really make sense, but this is some theories and ideas/opinions I have about the 9th book in the KOTLC series, because I know that I'm having a hard time waiting, and I'm sure some other people are too.

SPOILERS ABOUT LEGACY IN HERE

All has to do with the Keeper of the Lost Cities series by Shannon Messenger. All stories and characters belong to her!