Board Thread:Manga/@comment-25933225-20190729085225/@comment-36306777-20190802125808

1) That was my supposition, that's the most likely, but the only time Subjects of Ymir were turned into pure Titans with a scream were the ones injected with Zeke's fluid.

Eldians are stated to be already parts of the Founder's body though.

2) Yes, the first and the second guess are the most likely (they can both be true), tho I don't totally put aside my Ackerman theory, I just keep it in mind.

My problem with that theory is that it would be too easy. As you said, the Marleyans definitely tried that out on someone, but if it worked, they would've definitely used it for military purposes right away. Their army would be filled with superhumans.