Board Thread:Manga/@comment-38849221-20190321163015/@comment-37493549-20190326105251

I think titan shifters are able to resist the founding titan's powers. Reiner, Bertholdt and Ymir were able to resist Eren's influence the first time he controlled other titans.

It's also unclear how much control Eren would have of the founding titan's powers. He might not be able to immediately wield the full power, at least not at first.