@PrivatePublic I like your thought process but I'm going to go one farther. What if Sharon, Sadie, Alice, and Daleth are all shards of the "Original" Sadie who was so heartbroken by losing her true love that she split herself into fragments?
Honestly, even if this action arc isn't what I expected from this series, the action itself is very good. It's got movement, energy, and is interesting. If the author/artist goes and does an action series after this I would read it.