It seems it would still be more costly to spam/break down a CD. I think that is the main point of choosing CD over 5.2k, if you are offline a lot. Which is more likely for the average player to have, a few hundred thousand arhers or cav? Indeed the main weakness to CD is cav, but does the average player have the cav needed and willingness to use them to crack a proper CD? Keeping 100k cav or 100k phracts around for a smack on 5.2k is easy, having 5-600k cav to eat away at a CDs layers, not as likely.