I don't agree with favour given for healing teammates simply because it is character specific. Poseidon players will be the only ones to benefit from this unless another character has the sword of Athena.
It is a team game, everyone would have a role. If your role was healing then you wouldn't be getting that may kills probably. Also this is 100% untrue since as you pointed out the blade of Athena can heal, so can the lance or spear of Hades which I know Hades players that use it often. Might be others as well.
Just like fending people off for flag bearers should be given a little more credit. You didn't capture that flag all by yourself and bring it all the way back did you?
Here's the link to the thread created about the stun state: