First of all, Zeus was supposed to be very weak at that time. The original Zeus was a big thundercloud, but Nami took advantage of it and directly discharged the lightning in his body, giving his aunt a cruel trick. When he was caught by Brooke, there was actually not much lightning in his body, and he was corona, which was actually quite funny. As a mass of Lei Yun, he was corona.

The second point is that he has his own will. Although Lei Yun Zeus and Prometheus, the sun god, both made Homie with their own souls, they both have their own will, and they can act according to their own will, although they also obey the aunt's orders. Just like King Bam before him, he even helped a group of enemies escape in front of his aunt.

The third point is that Nami is scary enough, and it also has Lei Yun, which Zeus likes to eat. We know that Nami has the highest status among the straw hat regiments, and often gives a fierce hammer to the three major combat forces of the straw hat regiments, and none of them can fight back; Under the threat of Nami's power, Zeus's life was in danger, so he had to give in to Yu Na's beauty.

Zeus, like his aunt, has no resistance to good food! Aunt's characteristics are also obvious. Once you like a certain kind of food, you will always want to eat it! Once you haven't eaten it for a long time, you may break out of eating sickness! In this state, only the food that the aunt wants can be treated! So Zeus has similar symptoms, but Zeus's food craving is not as terrible as his aunt's. Compared with the aunt, Zeus's food craving is more just an addiction to gluttony. So Nami's weather bar is obviously Zeus's dream food, and it is not difficult to understand that he stays with Nami because of his eating disorder.

Based on the above three points, Zeus had to go with Nami. Of course, there is a little reason why he likes to eat Lei Yun given by Nami. It is estimated that this still accounts for most of the reasons. If there is no black Lei Yun, it is estimated that Nami will not be able to subdue Zeus, and he will not obediently follow Nami.

the above is only my personal opinion.