The universe was extremely enormous. Even if one had extraordinary individual strength, without a force large enough, one would not be able to achieve much in the galactic society.
The Black Star Army was among the top armed forces in the Galaxy. They had manpower, resources, money, ships, and everything. As soon as Han Xiao's highest order was given out, the Black Star Army's men in the Shattered Star Ring started executing the order immediately. They searched through one Star System after another and locked down all kinds of transportation hubs to find Aesop's whereabouts. The Floating Dragon Island's troops were also mostly dispatched.
Clearly, such a big movement could not stay hidden. It quickly attracted the attention of the entire galactic society. With just a little research, they knew that Dragon Emperor's elder had gone missing. To search for just one person, the movements of the Black Star Army indirectly affected dozens of Star Systems.