In my opinion it is important but nothing say two or three of our members are needed. If it was just you, Windel, Trevor, and I then I'd just send us to eliminate them easy enough. However Demous and Helios are still working on characters and to have about six elite assassins and maybe even eight if we send nako and kotaro it seems a bit of overkill. 

Besides it's not like our sanctuary isn't hidden well. Since I haven't elaborated on where our hideout is: It was well secluded and abandoned for at least ten year and only inhabited by a small band of monks. There's a rather large forest, some mountains, and streams so these highway men would need to go pretty well off the trail to find us. Of course they could've found out by way of attacking one of our supply groups that come to get us food, since well none of us are farmers like the monks here possibly where, and found it out that way.

I apologize if I seem stubborn or against your ideas I'm simply trying to think of a valid excuse for Xerxes to send the entire crew of six assassins anywhere and why he wouldn't just have him pick off key figures of say a political ring to help his friends get more power or eliminate nobles who wouldn't be sympathetic to our cause. Or even harass the rebels to stop them from gaining ground as Nightraid is still technically our enemy.