I have a theory that the Nerona family is the top family in One from which is Imu himself. I think that Mihawk is from this family and a former candidate of the Holy Knights but rebelled and decided to become a pirate to challenge strong swordsmen until he became the strongest.
I think that by the final war he will be forced by his family to return to Mariejoa and join the Knights of God as their commander in chief after Dragon/Shanks kill Garling or maybe Mihawk will kill Garling and replace him as the commander in chief, also I think he will face and defeat his Seraphim version before facing off against Zoro in the final war
I think that by the final war he will be forced by his family to return to Mariejoa and join the Knights of God as their commander in chief after Dragon/Shanks kill Garling or maybe Mihawk will kill Garling and replace him as the commander in chief, also I think he will face and defeat his Seraphim version before facing off against Zoro in the final war