Think this is a good time to revive this thread lol. Vegapunks message (and Egghead as an arc itself) is essentially a primer to set up the final war, which once again seems to suggest itll involve every major character.
Obviously theres still Elbaf left, which may explain why this silhouetted man exists next to Imu and may be the Burned Scar Man. This means Elbaf could focus on them and the 4th RP, and Lodestar/LT is our endgame after that