The "pick" IMHO is taking a pilot unaware of your presence period.
What???
So, how do you make sure he knows you're there? How do you know when he's detected your presence and he's "ready"? What if he knows you're there, but he's not ready? Is it a pick then?
If you shoot someone who isn't aware of your presence, shame on
him, not you!
By your definition, the vast majority of kills of new players are "picks". Trust me, most of them aren't aware you're there. If they know you're nearby, they probably don't know exactly where you are. Does this mean "vets" kills on new players are picks, more than a difference in skill level?
If you lose track of your opponent in a fight (so are unaware of his location), is his kill on you a pick?
I think the definition of "pick" is being wrongly broadened, so those who aren't happy with the way they died think they have a legitimate excuse...