Actually, the first to discover Chu You was not War Spirit Wind and Cloud, it's just that the players who noticed the anomaly in the sky were not certain that the serpentine figure was Night Ghost.
But who is War Spirit Wind and Cloud? He is a big shot from the War Soul Guild, he knows many things. The flying armies formed by various guilds were already disrupted because the Kaleidoscope Guild suddenly collapsed, which caused the alliance to lose Dragonhead, the boss they had previously agreed to fight under.
Keep in mind, the attack on the governing fortress was for the Kaleidoscope Guild, it was also this guild that initiated it. They put in the most effort too! Hence, the position of the governor was supposed to belong to the Kaleidoscope Guild, this was agreed upon from the start.
However, the Kaleidoscope Guild was wiped out by Night Ghost, and the fortress war is at such a stage, it is absolutely impossible to get the various guilds to withdraw.