A plot twist could be that Naruto discovers a long - lost connection between the Nine - Tails and some ancient power in Kumo. This could change the whole dynamic of his capture situation. Instead of being a victim, he might become an important figure in Kumo's internal power struggle. And this new - found connection could also lead to a new alliance between Konoha and Kumo in the end. Another twist could be that Naruto's capture was a ruse by Konoha's higher - ups to gain some secret knowledge in Kumo. Naruto was sent there on purpose, but things start to go wrong when Kumo figures out the plan.
Perhaps a major plot twist would be that Naruto is not actually Naruto. Kumo could have been tricked into capturing a clone or someone who has been transformed to look like Naruto. Meanwhile, the real Naruto is secretly working on a plan to expose Kumo's true intentions behind the capture. This could lead to a situation where Kumo has to deal with the embarrassment of their false capture and the potential consequences from Konoha. Also, it could be that during his capture, Naruto unlocks a new form of his Nine - Tails power that no one expected, which gives him an edge over his captors and changes the course of the story.
Well, a plot twist might be that when Naruto arrives to save Hinata, he finds out that Hinata has already made a deal with the Kumo ninjas for the sake of Konoha. So Naruto has to figure out how to honor Hinata's decision while still protecting her. Also, it could be that the Kumo situation is just a cover - up for a much larger conspiracy involving other villages. And there's a chance that the person Naruto thought was Hinata in danger was actually a clone, and the real Hinata is in an even more dangerous situation elsewhere.
One possible plot twist could be that Naruto discovers a secret connection between his family and someone in Kumo. This could completely change his understanding of his past and future.
In such a fanfic, Naruto might be subjected to various interrogations by Kumo. They could be interested in his Nine - Tails power. Maybe they would try to extract information about Konoha's secrets through him.
One possible plot twist could be that Naruto actually allows himself to be captured on purpose. He might have a secret plan to infiltrate Madara's stronghold from the inside and gather intelligence. Another twist could be that Madara discovers a hidden power within Naruto that he wasn't expecting, and this power either scares him or makes him change his plans completely.
A plot twist could be that the place they are captured in is not what it seems. It could be a magical or illusionary prison created by an unknown force. This would make their escape much more difficult as they have to figure out the true nature of the prison. Also, it could turn out that their capture was a self - fulfilling prophecy. Maybe Aizen's actions in the past led to a chain of events that resulted in their capture, but in a way he didn't expect. And Irukia could be the key to their escape, but he doesn't realize it until later in the fanfic.
A plot twist could be that Naruto's Fuinjutsu skills are actually part of a prophecy in Kumo. The village initially hid this from him, but as he progresses in learning, he discovers the truth and has to deal with the implications.
One possible plot twist could be that Naruto is captured but instead of Orochimaru using him for his own power gain immediately, he tries to turn Naruto against Konoha. He might show Naruto some 'hidden truths' about the village that are actually lies or half - truths, creating internal conflict within Naruto. Another twist could be that Orochimaru's experiment on Naruto goes wrong in an unexpected way. Maybe Naruto's chakra reacts with Orochimaru's jutsu and creates a new form of power that neither of them can control at first.
Well, perhaps they are captured by a powerful new organization that has been secretly observing them. This organization could be made up of powerful shinobi from different villages who believe that Naruto and Itachi pose a threat to their new world order. They capture them to try and brainwash them into joining their cause, but Naruto and Itachi resist and find a way to escape together, forging a stronger bond in the process.
Maybe the seventh swordsman has a secret power that is unleashed when Naruto is in a dire situation. This power could be something that was thought to be lost or forgotten in the Naruto world, and its appearance changes the entire dynamic of the story.
One possible plot twist could be that Danzo is actually being controlled by an even greater enemy. So, when Naruto is about to defeat him, he realizes that there's a bigger threat behind Danzo. Another could be that Danzo reveals a hidden power that he has been suppressing all along and suddenly becomes much stronger than Naruto expected.