WARNING
This contains some spoilers for Darian marvel, ok ya that's all
While chatting with my brother I has this theroy about the Tesseract.
What if the one thanos had was just another really powerful stone and he thought it was the Tesseract but instead goose aka goose the cat from captain Marvel aka the flerkin, still has it inside his stomach and had been keeping it for many years.
Ok I'm done now, bye
Please don't hate me.