The Rocky Port Incident is one of the biggest mysteries of One Piece which saw Law defeating 100 pirates and delivering their hearts to the World Government to achieve the status of a warlord. Although this was the only thing revealed about the event to this day, Eiichiro Oda briefly explained it in detail during the Weekly Shonen Jump Issue's 49 questions.
Oda revealed that Law's visit to Hachinosu Island was to gain information about a Poneglyph, making this event more 'interesting' than the fandom had perceived. Moreover, Law's alliance with Koby and Blackbeard, inspirations from real battles, and other things had the fandom asking for more answers.
Disclaimer: This article contains potential spoilers from the One Piece manga series and has the author's opinion.
One Piece: Exploring the Hidden Details in the Rocky Port Incident
One of the 10 One Piece questions featured in Weekly Shonen Jump Issue 49 of 2024 was about the details of the Rocky Port Incident, which led to Koby being titled the Hero. Although the author stated that answering it would take too long, he still told the details of the events because this incident might never appear in the original source material.
According to Eiichiro Oda, during the two-year time skip, Trafalgar Law wanted to infiltrate Hachinosu Island because it had an important Poneglyph on it. So, he planned on infiltrating a smuggling ship supplying goods to the island.
Unfortunately, Law mistakenly infiltrated the 'Rocky Port' ship and reached the island where he had to face pirates. While Law was battling these pirates, Blackbeard and Koby also arrived on the island.
Surprisingly, these three allied (for unknown personal gains) and defeated the pirates.
The end result was Blackbeard becoming the new ruler of Hachinosu, Law becoming the warlord (as he collected the hearts of 100 pirates he defeated) and Koby becoming the Hero (who protected the civilians while Law and Blackbeard fought). In classic Oda fashion, the question was answered with a lot of holes and the fandom wants to know more.
However, some questions might be in plain sight. Firstly, the Poneglyph that Law thought was present on Hachinosu island might be a Historical Poneglyph. This Poneglyph being a Road Poneglyph wouldn't make any sense because it belongs to the Man Marked by the Flames and his whereabouts are unknown.
After the death of Corazoan, Law became interested in knowing about the Checkered Fate (alongside getting his revenge on Doflamingo). So, him going after a Historical Poneglyph (that tells about the past) would make sense.
Following along, the smuggling ship Law wanted to infiltrate might be the same one that transported weapons to Kaido and Doflamingo.
These ships are also the ones that the Revolutionary Army caught in action and catching these ships was part of this army's 'rebellion against the World Government.' Following along, Law stealing the hearts of 100 pirates might also involve Gin and the others who were later confirmed to be present on Hachinosu Island during Vegapunk's speech.
The arrival of Blackbeard and Koby on Hachinosu might be inspired by The Siege of Charleston Port which featured the real-life Blackbeard. The event involved the pirate blocking the port of an area for nearly a month (which could be what Blackeard did during the fight).
Analysis and final thoughts
While some points sound too good to be true, some actually make sense like a HIstorical Poneglyph present on Hachinosu Island. Sadly, as Oda stated in the answer, the topic of the Rocky Port Incident might not get a spotlight in the series.
However, given how he has shed light numerous times on cases that he claimed to never touch in the manga, fans can expect this incident to appear in the flashbacks of how Gin and the others arrived on Hachinosu Island in the future.
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