User blog comment:Kaido King of the Beasts/Chapter 867: Suns and Daughters/@comment-910220-20170602010636/@comment-29325824-20170603202756

I'm not saying Carmel's soul possesses Linlin, their personalities are a bit too different for that, but I'm saying it's not unlikely that through the Soru Soru no Mi, its users personality can be influenced by traits of the former users. Due to their "powerful souls" and all that.

It could explain as part of the reason (but certainly not the only one) why Linlin went from an innocent child just trying to help others in misguided ways, to the selfish, insane monster she is now.

But as I said, I don't really have any real proof, just a hunch.