but Undertaker in chapter 60 said souls can't be put on another body so it's impossible for twinCiel to has Vincent's soul.
http://www.mangago.zone/read-manga/kuroshitsuji/an/kuroshitsuji-chapter-60.html/15/
but he's been experimenting with those corpses. it's been a while since he said that. Vincent's picture was the one he stared at saying "the earl is still among us"
true but he's been experimenting with the bizarre dolls and inserting a soul into them would complete the process so...
i don't really 100% join on the twins theory yet. mainly because, it's boring for me. it's too freaking simple. my joy for this series is that it is unpredictable, for me who can predict most things in stories. the twin theory is way too basic and simple. (don't eat me alive.)
but now, that theory that it's a doll who looks like ciel, that undertaker brought to life, and that Vincent's soul resides in it. now, fuck! that would be insane and amazing!