Board Thread:Theories/@comment-24346474-20170510180705/@comment-28958062-20170510185146

There must be a substantial difference between a serum meant to simply make mindless titan and one desined for those who are to become a shifter.

Ymir was supposed to wander forever as a mindless titan, while Eren was injected with the suppose of being turned in a shifter.

Meaning that the serum Ymir got was probably of way less quality then Eren's.

Probably the shifters's serum is a concentrate, while the serum designed for the mindless is watered down.

On Armin case I am not sure he got the size of the Colossal, cause I believe that it wasn't compatible with the Colossal power, remember that it was picked up to inherit the Coordinate.

Serums are made from titan's spinal fluid, it isn't too unlogic to believe that each successor of each titan power are to be injected with the corripective serum to get a better synergy.