The game needs to get better translations, it took them forever to fix Choza's mess. I believe Orochimaru's cold blooded is different from Deidara's in which an actual character has to be defeated to get the buff unlike Dei can be clones etc. Basically you can try to use Danzo, so when one of your ninjas are about to be defeated, you get the buff while they come back alive or I'm thinking of an actual resser like Jigo, can't quite remember, I need some sleep so someone else can clarify :|