User blog comment:Licht and Lux/Marco is not Dead Theory... A New One/@comment-205.154.150.226-20150211222631

!!! SPOILERS FOR CHAPTER 66 READ AT YOUR OWN RISK !!!

So it was revealed that whomever posesses the Coordinate either is god or is posessed by god. It seems that this is a monotheistic world, with the truth about the deity being kept from the world. Hate to say it, but I'm pretty sure that Eren had no major beef with Marco (then again, he did try to kill Mikasa), and he wasn't aware of his power as the Coordinate until the Clash of the Titans arc. Hate to say it, but your theory might be incorrect.