I think it is. I've had a few cases where my pursuer killed an npc that looked like me that was in the same group as I was. The npc wasn't just in the same group but right next (close enough to poison) and I didn't even get a lure bonus. I had this happen a few times.
And on a side-noteo any of you think if a decoy is killed it should still give you the lure bonus, even if it's far away from you?
I think you should.