This hotfix patch note mentions any frame being able to benefit from hunter adrenaline or rage if you have overguard active and no shields
Despite this, Kullervo (a frame that has Overguard built into his kit) doesn't benefit from Hunter Adrenaline or Rage in my testing.
I'm hoping this is unintended, and DE will allow kullervo to use rage/hunter adrenaline.
-Edit
Oops, it's for next week. I got ahead of myself. Sorry!