Board Thread:Theories/@comment-39665740-20190601184307/@comment-25933225-20190601204749

In the manga, it is said that Eren can trigger the power of the Coordinate when he enters in contact with a Titan of royal blood (we don't know if it works if that Titan is in human form, like Zeke, but I suppose it works too).

When he touches someone with royal blood but hasn't a power of Titan (Historia, Rod), there is still an effect (he gains memories of his father th two times it happens).

However, transfering to someone the blood of someone else, if they're not compatible, that might causes heavy health problems, but let's forget about this.

So, here is what I think:

- If he receives a blood injection from someone like Historia or Rod, this blood injection might give him some memories of the previous holders of his Titans, but nothing more.

- If he receives a blood injection from someone like Zeke, he might be able to trigger the Coordinate power, at least for a while.