Logic makes sense, the war in Yong and Xu States hasn't ended yet; Holy Church demands that three counties of Hexi contribute troops. Refusing the Hou Clan now is equivalent to refusing Holy Church...
It should be known that although these twenty-eight prominent families have surrendered, they haven't received recognition from Holy Church so far, and strictly speaking, they are still considered as bearing sins, belonging to the forces under Wanjian Holy Sect. If they refuse to send troops to help Holy Church fight, wouldn't it prove that they all still have second thoughts?
Twenty-eight families, twenty thousand people—if you even count Hou Clan taking the lion's share, almost every family would have to provide more than seventy percent of their elite disciples to make up the numbers, and they are very likely to be sent to fight in Hedong, which is practically a suicidal mission...