User blog comment:Neetaku/Grisha Yeager is Alive/@comment-26852230-20150803220125

One more thing, Grisha was found MYSTERIOUSLY walking around outside of the walls by Shadis... My THEORY is that Grisha may have been a wondering Titan like Ymir and then he came across a Titan Shifter (either as a human or a shifted Titan), Grisha then ate the Titan shifter and gained the ability to Titan Shift back into a Human... Ymir done this by devouring a Titan shifter, she was wondering outside the walls for about 60 years and killed and ate a Titan shifter so my theory may be correct...