As I got an extra 2 keys in CvC that are automatically added (thanks, can we fix this as well so it gets added to mailbox like some of the other rewards?..) I decided to use one on brutal for our clan. I am using the Easy Double Maneater comp:

https://www.deadwoodjedi.com/speed-tunes-4/Easy-Double-Maneater

All speeds are correct, masteries, goes the full 50 turns just fine, (using Fahkrin, Frozen Banshee, Jintoro).

I've noticed though, Jintoro doesn't use his A2 AT ALL on the Clanboss.. This just seems to be for Brutal as well, I run him on my 1-key NM and 2-key UMN comp (I replace Frozen Banshee with Turvold) and Jintoro always uses his A2 when available there.. but it seems it's broken on Brutal CB (Void affinity).