Eh we can all talk about barb munching and "mass recruiting" but at the end of the day majority of the CBS near the rim are either pretty inactive, incompetent, or don't bother cooperating with each other. We just reduced a CBS member from 20 villages to 1 in 3 days. Could've been faster if the trip wasn't so long. He was sharing the province with another (formerly top 10) tribe member who also lost around 10 villages from us in the same time frame, from the same group of people I cooperate with. We put a stop to other "barb munching" CBS members in other parts of the rim as well, and we'll keep on cleaning them up while the ones at the core are busy getting to the center.
Is it boring? Yes. Do I wish non-core CBS members put up better fights? Yes. It's a crappy job but it has to be done, and we're doing a good job at it.
You can say a lot of HUG members are barb munching noobs but at the end of the day the same could be said about majority of CBS members. The difference is that even if we do have them, there's also a lot of us who are very active and play aggressive, whether we're at the core or not.