Of these four junior elders sent to accompany him on the mission, two of them were acquaintances of Arthur.
These two were the Blood Spider Daoist and Daoist Battle Furnace. These two were his partners in the fishing game they had with the Milton family.
They had helped him acquire a lot of resources for cultivation by sharing the loot from that fishing game with him equally even though they were stronger than him at that time. So he was willing to shift his focus from his research for a little bit to chat with them.
Even though they used to be his seniors, they didn't dare act overly familiar with him. But they felt appreciated that Arthur didn't snub them and took some time to talk with them.
From their short chat, he learned that they too had reached the limit in terms of cultivation and the mastery of the host technique. If the conditions were right, they would try to break through right now.