Well is there anything special about Ymir? Annie didn't have much either. She had armor which you can get from a vial and she commanded those Titans to eat her . There isn't enough information to have such strict rules and what constitutes being a shifter and we don't know anything about the...
Here's my theory. Eldians are all of Titan blood and are all Fritz except for Reiss, the royal bloodline. Perhaps the head of the 9 Clans were Reese and all others were Fritz. Eren is Fritz, but not Reiss. If he was he would have been taken over by the first King's ideology. Ackermans are also...
Hmmm, but Eren already accounts for 2 of them.One from Reiss and one from Grisha. Where Grisha got his is the mystery. However, since Reiss has the power to control titans AND manipulate memories I wouldn't be surprised if he had 2 and therefore Eren actually has 3 by himself.
I'm most curious about the 9th Titan Power. Did Grisha really steal his power from one of the 7 warriors or is there another party that intervened to bring Grisha back to humanity and therefore there's still another warrior that isn't accounted for? Is this other warrior the one keeping Ymir...
But doesn't that also bring into question the intentions of Ymir to begin with? She showed a clear interest in Historia from the moment she heard of her and protects her with her own life. Clearly this is speculation, but considering she had spent so much time snooping around to learn about...
Something I've thought about that I haven't seen anyone bring up:
What are the possibilities experimenting with the coordinate now that they have two titans?
Granted we haven't seen the coordinate affect shifters as Reiner wasn't affect when Eren first used it. But who knows, maybe having...