>>281964860
I still think he's Man Marked by Flames. It makes more sense now than ever that we know Rocks is Davy D. Xebec

>burned in the destruction of God Valley after being left for dead
>ship burned black just like Black Pearl from Pirates of the Carribean
>sails around sending people to Davy's Locker
>crew mates who abandoned him on the island all burned to death, BM and Kaido by lava, WB also by lava but from Akainu
>the only guy strong enough to hold a poneglyph solo
>promised to return to Imu
>Is a reference to Shishio from Ruroni Kenshin (Oda was the apprentice there and draws much inspiration from it), a former strongest swordsman of his era who was betrayed and left for dead after being betrayed and burned alive before basically becoming the scarred by burns man with fire powers
>would explain his ties to the underworld