I used to feel that DRK was lacking CD until I got TBN. I mean TBN is amazing, it's literally an oGCd Inner Beast you can use in both stance!
Yes you want to save rampart and shadow wall for Tank busters but we still have convalescence, anticipation, your selfheals and dark mind to some extent.
I don't feel that DRK is lacking in CD with TBN.
for my pov, TBN is better than Inner Beast which is already an amazing mitigation tool.
It's hard to complain when you have that.