hehe, didn't know you can count adren shots, but take into account that in some servers with fast charge almost all fights are with adrenaline, so it's more a feature than an advantage there.
It's obvious that a player who gives more hs has an advantage with adren. Since all bodyshots make half the damage, who gives more hs makes damage proportionally faster (in comparison with the average players) in servers with adre on, than in servers with adre off
And he can also kill more easily, since if you give damage faster, well, you finish your enemy faster. So removing damage, to leave only kills, won't make a change either, adren servers would still give an advantage to people who make more hs