The reason is that Valery does not believe and does not see useful that the Lowflame territory is dispersed. It doesn't seem right to him that they being scholars join the other families, for that reason he proposed something different.
"Is it okay with you if you take over an association?"
"Association? That's not much lower status than the Families or the Human Union" Rebecca after spending several hours talking with Valery had a clear idea of Valery's territory, she even became quite interested in the human union.
As a historian she felt that this would take Valery's territory on a different path than other territories.
"I don't think you need power and I don't think you need to fight either, much less with it in your arms. your profession is excellent for many things and you can be off the battlefield, both you and your people would make excellent advisors with the information you have."