I think this theory tells us that Shanks did respect Roger, otherwise he wouldn't have cried when Roger was executed but he was consumed with rage before that. Would make sense if he regrets it that much now. But even tho I think that the theory has some basis, it's unlikely tbh.
Exactly, that's what my theory is about. It's not about Shanks being evil and his intentions in the present/future. He may have committed a crime out of spite, and then repented and redeemed himself as an adult. It would add more layers to the character.
I think the biggest turning point in Shanks' life was the Straw Hat. When Roger gave it to him, Shanks definitely had another vision of Roger, and not just the man who killed his father. He has matured.
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Of course, this thery could open loopholes for us to suspect Shanks's nature at present (although I don't really dare). Understanding that Shanks could have committed such a crime consistently gives us insight that he is much more meticulous and strategist than we realize. He is a walking shadow.