Forum:Sora ven Roxas and Vanitus(may indclude spoilders)

Hi I thought about some things about KH series and about KHBBS and KH3 if sora accepted vens heart and ven's hearts was in vanitus we maybe going to meet vanitus or ven in KH3 like sora will have visions that say "embrace the darkness" that vanitus will say to him or sora will see visions of ven and why roxas similar to ven? and in khbbs in the trailer (gamescom trailer) I think I saw ansem the wise when he was younger along with Xehanort when he was a kid but I saw that in the end of KHBBS master Xehanort takes terra's body and become ansem apprentice so how we see him in the trailer and one another thing how is that in KH1 kairi didn't have a heart (it was in sora's body) and she didn't become a heartless or a nobody You may comment on my thoughts or answer me one of the questions