The mastermind behind Detective Conan has always been controversial. Some people think it's the Doctor, while others think it's someone else. In fact, the answer to this question depended on a detailed understanding of the background and plot of the story.
If you think that the mastermind is the doctor, then this idea is based on the plot of Conan's original work. In the original novel, the doctor was Conan's father, the famous detective Kudo Shinichi. Therefore, if the professor was the mastermind, then the mastermind was Kudo Shinichi.
However, some people might think that the mastermind behind this was not the doctor. They believed that the mastermind might be someone else, such as a senior manager, a member of an organization, or a villain. These people's thoughts depended on their understanding of the plot and background of the story.
In short, whether the mastermind behind Detective Conan was the Doctor or someone else depended on the understanding of the story and the detailed understanding of the plot.
The new doctor in Detective Conan was killed. In Detective Conan: 15 Minutes of Silence, a new doctor was killed by an unknown person. In this episode, Conan discovered that the new doctor was impersonated and discovered the truth.
Ms. Judy wasn't sure if Haiga and Conan were a threat. In the series, Ms. Judy seemed to have a certain influence on Haihara, but whether she was a threat to Conan still needed further observation.
Detective Conan was a mystery novel. None of the characters were simply the strongest because they all had their own unique skills and characteristics to solve problems in different scenes.
However, in the story, some of the characters in Conan may be considered the strongest, such as:
1 Kudo Shinichi: As the protagonist of Detective Conan, he is an excellent detective and reasoning master with excellent insight and strong logical thinking ability.
2 Maori Kogoro: As Conan's father, he is a very experienced detective and has an extraordinary talent in reasoning.
3 Akai Shuichi: He is a very mysterious character in Detective Conan. He has extremely high reasoning and communication skills and is considered one of the best assassins in the world.
However, every character in the story has their own unique abilities and weaknesses, so no character can be considered invincible.