Actually, this is not the case, because Buou has many forms. But in any case, the initial Bouo can't be said to be the strongest. Next, I'll introduce you to his other advantages. Let's start with his initial form. We can only say that he is strong because he is crazy and only knows destruction. It is also for this reason that the king of the world says that he is powerful. Don't be misled. Tell him to see Bouo later, and he won't feel that what he saw at first is the strongest.

Next, let's talk about Fat Buou. In fact, Fat Buou is much stronger than before, because it has absorbed many world kings. Its form, the will of madness and destruction in the body, is suppressed by the kindness of the king of the world and becomes more and more kind. This form of him is also the prototype of the next Buou.

Let's talk about the next one, that is, pure evil thin Buou, which has not appeared for a long time and has no special achievements. Then it swallowed the fat Buou and became the most suitable for fighting. Big Buou and Big Buou swallowed Bike and Gotenks, also known as Wutiankesbuou. Later, because it was time for the Monkey King and Vegeta to fit in, they degenerated into Bikebu, and then absorbed Sun Wufan, the so-called strongest Wu Fan cloth, because every time the Muppets absorbed other people's energy, they became stronger and had the special ability to be absorbed. If that's the case, the little Buou who has absorbed nothing is the strongest, so what's the point of devouring others later?

If you only rely on Kaiōshin at that time, it's really too one-sided. Moreover, in the cartoon, Kaiōshin said that Buo is the most evil. Of course, comics will be more certain than animation.