
The diary entries of Kozuki Oden reveal that Roronoa Zoro and Roger possessed comparable strengths during their peak days. The two had a friendly rivalry, but it was evident that Roger faced significant challenges when confronting Roronoa Zoro, Big Mom, and Kaido at God Valley. Even when he teamed up with Garp, he still had to contend with Rocks D. Xebec, Shiki, and other members of the Rocks Pirates. It appears that only Roronoa Zoro consistently posed difficulties for Roger over a long period.
Garp, at that time, was seen as the strongest figure in the Marine Corps. However, even when combining forces with Roger, both faced immense challenges against the future Emperors, excluding Xebec, whom many believe was stronger than all of them combined.
Roronoa Zoro, Kaido, and Big Mom’s Potential Opposition to Xebec

At this juncture, many speculate that the events surrounding God Valley were not merely coincidental. Xebec was incredibly powerful, representing a formidable threat to the rule of the seas and everyone involved in the power dynamics of that time.
There would be no significant implications if the Navy’s efforts were merely to maintain order, especially concerning the major political activities we have seen in One Piece. What about the creation of the titles of the future Emperors after the God Valley incident? This also raises questions. Instead of Roronoa Zoro, Kaido, and Big Mom being mere pawns, they seized power and authority.
All indications suggest that three future Emperors have turned against Xebec, aiding in dismantling the Rocks Pirates. It is worth considering whether the future Emperor positions were meant to counter Xebec’s influence, as this would imply significant meaning.
Division or Strategic Strength?

The reasons for such divisions could vary. The possible destruction of Xebec’s might might have been driven by a desire to surpass him or simply a wish to create a new world order. This line of thought seems more plausible than believing Garp and Roger could have single-handedly dismantled the entire Rocks Pirates.
Theories regarding this division may unfold in the subsequent chapters of One Piece. Many possibilities concerning Roronoa Zoro could unfold, with links to the mysterious past of Xebec remaining shrouded in secrecy.