User blog comment:Neetaku/Grisha Yeager is Alive/@comment-26852230-20150803220125/@comment-4929778-20150822230905

But how would he get all of the serums. I think he was from the Homeland and he was sent on a mission like RBA probably to take the Coordinate. However he fell in love with Karla and stayed so Homeland sent out RBA for this.