The pressure of Kaden's Dao had blanketed the entire space, making everyone, including the four overlords, look at him with expressions that showed they were wary of him.
That is normal because when it comes to the Dao, it is all about one's comprehension of the laws translated into the Dao. One can have a weaker cultivation base, but if their understanding of the Dao is high enough, they can fight those with much higher cultivation than they.
Kaden is only a Universal God, and while his cultivation base is the lowest, his understanding of the Dao is so high that he has made everyone wary of him.
They are not scared, far from it.
With their cultivation, they can easily crush him. However, that also doesn't mean they are safe from him. Kaden's understanding of the Dao is enough to injure their Dao, which is even more dangerous than straight-up getting their heads chopped off.
