Why the "Attack Titan" holder before Grisha knew Armin and Mikasa name?
Why the "Attack Titan" holder before Grisha knew Armin and Mikasa name?
I believe the reason why Kruger knows about Mikasa and Armin is because its the special power of the Attack Titan because its special power wasn't revealed or cleared yet. Kruger maybe saw a memory of Grisha because Grisha said almost exactly like Kruger's when he was injecting the serum to Eren.