User blog comment:Oodronesoo/Crazy Theory/@comment-15760805-20131118005815

Ok this is my first warning about minor spoilers (well if you haven't caught up with the manga o.o)

Actually if you're reading the manga there is a chapter called before the fall when a titan swallows a pregnant woman and then the kid inside the woman is actually alive after the titan throws everyone up and he is known as the "titan's child" so in my theory he must be the first shifter because he has some titan dna in him.. And maybe this kid's dna is the source to make people titan shift.. Just a theory