Honestly if he is fighting for Eldians that would be a huge turn off for me. Don't you guys remember that page where the survey corps are running towards him and he's so MAD at them that he thinks "they have to learn their place" or something like that, and then crushes the rocks into his hands. What are you going to tell me, even his thoughts and emotions are constantly under control? The thing is, Zeke originally was thought to be an asshole. He is a bad guy, but smart. If he is plotting something then the story could be really great, but if he's not then it means that our boi Hajime screwed up and ended up changing Zeke's personality totally.