Board Thread:Manga/@comment-27125793-20190202152111/@comment-36307699-20200614011059

Jumbernaut wrote: Even before Yelena told Zeke's plan to Eren, it would already have been in the eldians best interest to have Historia bear a child of royal blood. Whether it's cruel or not, at the time it was already something essential to the survival of "humanity" within the walls.

Also, since Zeke's plan was to sterilize all eldians and allow them to live the rest of their lives, he himself was only going to live for one more year or so. After his death, there would be nothing stopping Historia to undo the sterilization if she wanted to. To secure the end of the titans for sure, Zeke could have instructed Yelena to kill Historia and her baby once he achieved his goal, to end the royal bloodline. That would also prevent the Founding titan from ever using the rumbling, so her death would have to be kept a secret to prevent an assault from the rest of the world. I agree with you about the possibility of Zeke Yeager plan on killing Historia. Believing in the possibility that those so called Titan Serum are actually poison.

Imagine this, Zeke Yeager has been retrieved and sent back to Paradise Island. Zeke Yeager is then chained to a facility and Historia receives the titan serum, which Yelena provided. Historia injects herself with the serum while everyone (Paradise upper commanders) watches on. However, instead of her turning into a titan, she kneels over in agony and dies right in front of everyone. There will be mass panic as the Military runs all over.

Then suddenly, Zeke Yeager somehow lets out a massive scream and many Paradisians turns into titans. The military who didn't turn will either get slaughtered or began fighting their transformed comrades while Zeke simply vanishes.

Afterwards, Zeke Yeager will meet up with Eren and with some hope of a miracle, convinces his little half brother to join forces and initiates Zekes' plan. It will happen swifly and without anyone noticing. And once it is all over, Zeke and Eren Yeagers will watch the sun setting as humanity destroys what left of Paradise. At that moment, Zeke Yeager will finally be at peace and saved Eren from their evil Father Grisha.

That is no doubt what I think is Zekes' plan all along, and the reason which Yelena was not involve in Historia getting pregnant. Everything that he says and do is for his own benefit and not everyone else.