Man marked with flame

So, it is just baseless so don’t hate on me but what if rock D Xebec is still alive and he is the one marked with flame. I was rewatching few episode and it is nowhere written rock died, and as we know most of the pirates were alive and 3 even became yonko that mean Xebec might be alive too, and the reason i am saying him man marked with flame is dumb but bcoz his ship and the ship that was shown when blackbeard was telling about them was pretty close and vortex in the sea he is the only one and above that he was a man with a eye patch. So just saying… dont hate me give me reason why no or you can add few things