but only shifters are controlled, if normal ones also had people inside, that would have been discovered long ago.
I think all titans are originally humans and even the mindless ones...
my theory is that the mindless ones have lost control over their titan forms when they were originally human and then "changed species", thus you don't see their bodies anymore because they are "one" with their titan form and have truly became a monster, why the napes of their neck are still a weakness when their body doesn't reside anymore?
Well I don't know... because only the creator would know that, I guess you could think logically and say maybe the brain or something is in there but they would have maybe.. seen that after killing countless titans?
Or we could just go anime-logic and say they are now fully fused with the titan and there is now only the titan body and the nape of their neck is their weakness cuz we can't make them beyond overpowered ( and could add some depth like something like the nerve system or w/e resides in the neck that shuts off the regeneration etc..) basically whatever the reason the anime/manga gave when they introduced the weakness for titans, only difference being titan shifters reside inside the neck while mindless ones do not.