Owen Bertram didn't need to show up in person, as he asked the Mesmerizing Demon through Lord: "What was the deal between him and Dandelion?"
The Mesmerizing Demon's speech was still somewhat rusty, so it placed a blood thread on Lord's hand, transmitting the thoughts directly. Adolph Benson's contribution to Dandelion was much bigger than Nolan Gordon's. The movement of Herb Gatherers in the Extinction Domain was pretty much grasped by Topeka Hall, and they even knew about the actions of some bureaus in the Imperial Court, such as the Horizon Bureau.
Among the Herb Gatherers, Nolan Gordon might not be the only puppet. Their movements were all provided by Adolph Benson.
Moreover, as Adolph Benson's status increased, he also had access to some secret scriptures of Topeka Hall, all of which were given to Dandelion Demons.