They didn't remove AK card or BoP from drops, why should KK card be any different?
I'm kinda opposed to have those drops supposedly exclusive to certain instance dungeon to be accessible, and can be dropped massively. with Exp/Drop event, few of my friends already lacked up like 5~6 Hodremline cards and prolly more. this could happen again and it will seriously break the gaming balance. But yea, as you said, KK shouldn't be different if they actually put them there.