I would have loved to see Caroline going back to Klaus for more information on it once she realized that Elena was sired to Damon. He was the one who tipped her off, so it would make sense that he would know more about it. Are we supposed to believe his experience on the subject is only from his hybrids? He's a freaking original! There could have been a whole story about the first time he and his siblings realized that someone was sired and how that played out.

Vampire humanity(and the struggle with it) is one of my favorite subjects, but when you water down a vampire to just being basically a human with superpowers who happens to need to drink blood, you lose so much of the depth of what those characters should be and in the case of The Vampire Diaries it starts to just become more about their personalities and whether or not they simply want to be good or bad, instead of struggling against their nature or giving in to it.

Liv hated him before the merge, but I think it would have been so interesting to see her want to be around Kai just because she misses Luke so much. Or to see Kai get a chance to have a relationship with Jo on their terms instead of their father's. He would have made an interesting addition to the Mystic Falls group too since Jo and Liv were already involved with them. Plus the obvious pro of getting to see Bonnie and Kai figuring out some kind of relationship after what he did to her. I'm pro Bonkai, but even if they didn't fully explore a romantic relationship between them it could have been good to see Bonnie sort of in control of any redemption he might get. It could have let the show center her story more, especially after Nina left. There was just so much potential there that could have made for a more interesting season 7 than what we got. Even if Kai didn't become a heretic, his interaction with Lily and the heretics would have been something interesting to see because they were both banished to prison worlds by the Gemini, and the heretics themselves had been cast out of the Gemini coven.

Who cares that they are all overlapping and conflicting? That's the fun of shipping!

It's tragic that they didn't have him stay there longer while the two of them worked on getting rid of the heretics. Maybe he would have actually finally learned her coffee order if he had. (Just give me my Bamon sitcom dreams, okay?)