Board Thread:Theories/@comment-32425639-20170629030127/@comment-31641135-20170703091042

If I'm right Zeke was brought up to be like the owl guy a sort of spy who would help the resistance but he later got manipulated by the Marley and turned both his parents in with his Mum becoming a titan and Grisha getting the Attack Titan power. I would like to think of him in a similar way to Reiner with the split personality but not as severe.

He wants to save Eren whilst fighting for Marley who wants to kill Eren basically. I think he still believes what their dad did Grisha was wrong but Eren thinks it's right or at least still doesn't know all the points which are where Zeke may fill out the gaps to make his dad's motives more clearly. As hes a Royale he can use his beast titan powers better however once a new person obtained them the powers will go down a lot to the point they were nothing compared to what Zeke could use.

He may want to team up with Marley simply because he would be the only person that we know of on their side that could use the coordinate so if he obtained ti then allowed the new person to eat him they would obtain both beast and coordinate powers. But like I said as the new person would not be Royale both powers especially the coordinate would be useless resulting in a loss of 2 titan powers more or less.