Much of the support for that came from somewhat circumstantial evidence, like how Shanks’ scar was never shown when he spoke with the Five Elders, but with a mysterious Shanks-like figure ...

I did not receive this scar in one of my duels with Hawkeye. This was the doing of Teach, and it wasn't as if I was caught off guard. Do you understand what I'm saying? — Shanks to Whitebeard He ...