Really wonder how they're gonna do the Destruction theme with the Summer Maiden
Choice = Fall: Cinder & Pyrrha, who constantly move towards their life goal/choice (being powerful; being a huntress). Also in Cinder's flashback "you make that choice, you'll be running for the rest of your life"
Knowledge = Spring: Raven, who learned the truth and ran from it in fear. She then twisted it around and presented a false Maiden to the world
Creation = Winter: Penny & Winter, Penny herself is a great creation, while Winter has worked hard to create a new life and reputation outside her family name
Destruction = Summer: ?
I dont know how they'll do Summer unless she joins Salem's side/is "evil". Maybe Cinder will take her power? Cinder herself has demonstrated a lot of destruction
They only way i can see them turning "destruction" into a "good" thing is if they find a way to push a harmony (ex. how the universe has to be balanced) or circle of life thing (ex. wildfires (that do happen to occur often in the summer lol) and volcano explosions destroy their surroundings, but it provideds rich soil that paves the way for life)