Uhhh nice theory, it would be a nice way to announce Summer and give her more screemtime yeah!
I´m with those buddies thinking that Nami was the reason of Summer´s disappearance, it has been discussed many times here but i don´t get tired of saying it, Nami is not as cool as she seems!
But is just a intuition, nothing really plausible.
If your theory is correct then i´m pretty sure many Nami fans won´t be happy, but for me would be cool, i tend to like dark characters so if Nami is the guilty of her disappearance then i´m ok... At least if what she did is not really bad, like attemp of murder or something
.
One way to give Summer more affection could be in the therapy sesion right? Maybe we can see some flashback and get to know more her personality and maybe step by step we start liking her, at least people like me ,who don´t feel anything in particular for her character yet.