I think it's about the guy Kamo Noritoshi which is a sorcerer who is inside Getou Suguru right now. He's a really old man from decades or even a few centuries ago. He is able to live through centuries by jumping bodies by transferring his brain into the bodies like Getou's body right now. It seems like he also jumped to Choso's & Yuuji's father's bodies somewhere in past and while living as their father's identities he had choso & yuuji separately. So technically they have different fathers physically but the brain was of the same person that is Kamo Noritoshi. It's like both of their fathers had the same forehead scar like Getou Suguru's.
Sukuna will probably take over soon, and I have a sickening feeling that Choso will die...WHAT DID HE MEAN BY 'YOUR FATHER HAD A SCAR TOO' OR SMTH LIKE THAT WHAT AM I MISSING???
My anxiety is also rising...my concern for Yuuji is over the roof but I know if I was there I wouldn't be able to do shit