"Only whispers and rumors," Thrawn replied. "My system for gathering information is very thorough." In other words, the only reason Thrawn knew about Keeper was because his spies were very good at their job.

"If they are as valuable as you say, then I look forward to meeting them." Perhaps he could convince them to give him some of their loyalty. Not to undermine Nine, but so that he could take them in should anything happen to Nine or his spy network.