I have no idea if you remember me, or if you're still active, but I'm Cali / bibliomaniac from back in last November. I quit the wiki for a bit but now I'm back and just wanted to drop by and say hello! It's been forever.
Okay so this my theory... Idek if it makes sense but it's my only hope.
Remember when Sophie enhanced Keefe in lumenaria in Lodestar? He said he got a glimpse of her heart emotions and HE GRINNED.
We know from lord Cassius' book that the heart emotions are purer than the mind so maybe Sophie like Fitz from the mind but her heart yearns for Keefe and when Keefe finds out he smiles cause he loves Sophie?
Um not any that haven't been stated. U haven't read Flashback but it seems like Alden is telling Keefe to say away from Aophie and Fitz and let them get together, which is why Alden went WAY down on my good guy list.