Starscream and Galvatron meet on different terms...
So YES to everyone whose wondering! Starscream IS getting a redemption arc in this AU!
Starscream will meet up with Galvatron and both of them bond over the shared trauma of being at the mercy of an abusive master, during which Starscream will think about what he's done and begin to learn to heal.
Thinking about tagging this "GalvaStar Redemption arc" on tumblr for clarity.