It starts at a specific point in the manga, but I can't recall exactly without looking it up. You might want to check some manga forums or dedicated fan sites for the precise chapter.
Based on the information provided, it could be concluded that Wu Zhu was more powerful than a martial grandmaster. Wu Zhu was described as a hidden great grandmaster with unfathomable martial arts strength. His combat power was far above the four great grandmasters. He had precise algorithms, amazing speed, and endurance, as well as powerful laser eyes. In addition, Wu Zhu could also imitate people at the level of grandmasters, displaying superb imitation abilities. Although the Great Grandmasters each had their own unique martial arts to the extreme, Wu Zhu's strength surpassed theirs. However, the specific reason why Wu Zhu was more powerful than the martial grandmaster was not mentioned in the information provided.
Based on the information provided, it could be concluded that Wu Zhu was more powerful than a martial grandmaster. Wu Zhu was described as a hidden great grandmaster with unfathomable martial arts strength. His combat power was far above that of a great grandmaster. He had precise algorithms, amazing speed, and endurance, as well as powerful laser eyes. Although the martial grandmasters each had their own unique martial arts, Wu Zhu's strength surpassed that of a martial grandmaster. However, the reason why Wu Zhu could not become a martial grandmaster was not mentioned in the information provided.
Based on the information provided, it could be concluded that Wu Zhu was more powerful than a martial grandmaster. Wu Zhu was described as a hidden great grandmaster with unfathomable martial arts strength. His combat power was far above that of a great grandmaster. He had precise algorithms, amazing speed, and endurance, as well as powerful laser eyes. In addition, Wu Zhu could also imitate people at the level of grandmasters, displaying superb imitation abilities. Although the specific reason was not mentioned in the information provided, Wu Zhu's strength surpassed that of the great grandmasters.
Based on the information provided, it could be concluded that Wu Zhu was more powerful than a martial grandmaster. Wu Zhu was described as a hidden great grandmaster with unfathomable martial arts strength. His combat power was far above that of a great grandmaster. He had precise algorithms, amazing speed, and endurance, as well as powerful laser eyes. In addition, Wu Zhu could also imitate people at the level of grandmasters, displaying superb imitation abilities. Although the Great Grandmasters each had their own unique martial arts to the extreme, Wu Zhu's strength surpassed theirs. However, the specific reason why Wu Zhu was more powerful than the martial grandmaster was not mentioned in the information provided. Therefore, the specific reason could not be determined.
Based on the information provided, it could be concluded that Wu Zhu was more powerful than a martial grandmaster. Wu Zhu was described as a hidden great grandmaster with unfathomable martial arts strength. His combat power was far above the four great grandmasters. He had precise algorithms, amazing speed, and endurance, as well as powerful laser eyes. In addition, Wu Zhu could also imitate people at the level of grandmasters, displaying superb imitation abilities. Although the Great Grandmasters each had their own unique martial arts to the extreme, Wu Zhu's strength surpassed theirs. However, the specific reason why Wu Zhu was more powerful than the martial grandmaster was not mentioned in the information provided. Therefore, the specific reason was unknown.
In fanfiction, Percy could be stronger due to the fact that he represents a new generation. He combines the powers he inherits from Poseidon with his own human ingenuity and modern - day knowledge. This combination gives him an edge. Also, fanfiction writers often like to play with the idea of the underdog surpassing the powerful. Percy, being a demigod, is still in a way an underdog compared to a major god like Poseidon, and making him stronger creates an interesting and unexpected twist.