Eiichiro Oda just confirmed it wasn't Shanks who severed Kid's arm as many believed; the true culprit is another member of the Red Hair Pirates.
SBS, short for Shitsumon o Boshū Suru, is where author Oda addresses fans' queries, unveiling valuable insights about the world of One Piece and its characters.
The world of One Piece is full of surprises, and SBS 107 once again proves it. In One Piece SBS 107, a particularly intriguing revelation was made: Benn Beckman, not Shanks, is responsible for severing Eustass Kid's arm. This new truth adds another layer of complexity to the already rich and captivating world of One Piece.

The question leading to this revelation stems from a dialogue in chapter 1076, where Lucky Roux says: 'Gyahahaha! You're right, Beck! Who do you think got him mad?' Oda's response, while simple, is shocking: 'Indeed, it seems he did! This is the world of pirates, where only the strong prevail!'
The newly disclosed information above is truly staggering for several reasons. Firstly, it marks a significant turning point in Oda's skillfully woven narrative. Many fans had believed it was Shanks, the Red-Haired Emperor, the master of Haki, who severed Kid's arm. Kid himself consistently expressed resentment when discussing the Red-Haired Emperor.
Surprisingly, Benn Beckman is revealed to be the one who took Kid's arm, shedding new light on this entire rivalry.
So, who exactly is Ben Beckman?
For those who may not recall, Benn Beckman is Shanks' right-hand man and the first mate of the Red Hair Pirates. He's not only incredibly intelligent (regarded as the smartest in East Blue) but also a skilled marksman and a talented commander. While not as prominently featured as Shanks in the story, his presence always exudes authority and power.

The revelation also opens the door to new theories. What motivated Beckman to take Kid's arm? Does this cause tension between him and Shanks? And how does Kid feel knowing that it was Beckman, not Shanks, who caused him to lose his arm? These are questions fans will surely continue to debate until more information is revealed.