Possession

So basically what the title suggests would hope have been in transition into a tribrid had inadu still possessed her while infecting her with her magic?

I have a question. In vampire diaries vampire souls could not survive in a human body. we saw this with the vampire Florence in Jo's body, and with stefan in the body of a man named Marty. However in originals vampires regularly inhabited human bodies. such as Finn in Vincent's body, Kol in Caleb's body, Rebekah in Eva's body, and many other circumstances. Why was it possible for vampires to inhabit human bodies in originals, but not in vampire diaires?

After Aya killed Rebekah, Rebekah then woke up in her in her own body, but she wasn’t desiccated and she went without blood for six months and she didn’t desiccate, but then Katherine was in the tomb for a few weeks and she was desiccated until Damon fed her blood. Can someone answer why Rebekah didn’t desiccate?

As we all know in season seven of vampire diaries it was revealed that the souls in the Phoenix Stone couldn't survive in the body of a human. But in season two it was shown that Klaus was in Alaric's body. How is that possible? I need anyone's theory, because I have no idea how this is even possible. If Klaus was a vampire at the time how did he survive in Alaric's body?

In Legacies recent episode Vardemus had one hourglass is that same one which Esther had in s02e09 or 10 (I don't know the exact episode). In the attempt of transferring Rebekah to Cami's body?