Gu Kaiyuan didn't possess such immense power right now, but he knew how to leverage the strength of others. Even though he had left the capital, he wasn't completely disconnected from it. On the contrary, the people he left behind in the capital would gather as much information as quickly as possible.
He was currently without power or influence, but having fought the Third Prince for so long in his previous life, he naturally knew some of his weaknesses and hidden factions. He believed the other Princes would be very interested.
He hadn't revealed this information earlier because he was considering his relationship with the Gu family. Now that the Gu family hadn't been successfully reinstated but merely received the same pardon as everyone else, it was an unexpected joy for him. As long as the Gu family did not re-enter the imperial court, even if he got mixed up with the Third Prince, the implications wouldn't be as widespread.
