The fact that the Brimstone family had someone make contact with this new demon lord was a troubling thought for them. It was already bad enough that the Morningstar family had interfered with the Gren Circle's retrieval mission of the two deserters, so the idea that the brimstone family was somehow involved with this new family would be a nightmare for them.
However, it was still a possibility that they had clashed during one of the Brimstone family's many discrete missions to the Darknar region in their demon lord's pursuit of immortality.
"I agree. We should find out the Brimstone family's stance on the matter being attempting to make use of them. Even if they're in league with this new Demon Lord, there are other ways of making use of them."
As everyone agreed on that proposal, someone else asked a reasonable question.