I heard a few ppl say this though I have not tested it myself but being that I'm heavy in necro it's something I'm going need to confirm. I hear that if you have a pet attack and it help kill a target the dmg your pet does will not count to you contribution for that rift fight.If this is true it need to be fixed i do know if your pet kills a target and u never attack it yourself it wont count so this may be true.