Theory I thought of after chapter 1180, help me add to it.

I’ll put it simply, after seeing IMUs abilities. I have a feeling the “man marked by flames” was due to a conflict with IMU. Is there anyone important enough that could be said man with the last poneglyph, who also had a scuffle with IMU resulting in the flames.

As I’m writing this the first person that came to mind is Rocks, if Garling only thought he finished him?

Other ideas? Thoughts?