>>5106
>The nature of Cosmos' possession of the princesses really interests me a lot more than I thought it would.
uhhh,someone out there has a mind control fetish...

>Twilight Sparkle seems in control at first but says he hears a voice saying "Find the rest" over and over again. I tried to go back and look to see when exactly Cosmos took full control but upon reread I'm a bit confused on the nature of it.
I suppose that the abundant reference of that answer comes because of a progressive but a slow build up of that problem. You see this formula constantly in episodes in which every little thing that goes wrong leads to a great disaster (like the finale for example). About its nature, I imply that the voice is Cosmos, starting first with her mind and then taking all over her voice the more Twilight wears the necklace, the more she gets stronger and more capabilities to take over her bodies and then, her actual body. About taking over Luna so soon, I suppose that her levels were enough to conquer her body by that time.

>Cosmos Luna reply in pic related and Twilight still making an incredibly detailed plan with notes after it seemed like it had switched over to Cosmos being in control almost makes me think there was a bit of them shining through or a bit of a mind merge going on.
eeeyup, it´s more like talking to her own self but with different takes at those thoughts she is exposing to Discord, like inner roleplaying for expressing her wish towards Discord. In the end, they are all less than puppets and more like representations of her mind scattered in those stars (and now, characters)

>Afterall, pic related was a joke line.
eeeyup, how can one know about her boredom if no one can hear Cosmos?
I think that the thing gets even more ridiculous when Luna and Twilight are dancing because of the "Always Wanted" line.