Leaderboard “Destroyed per battle” displays amount of SpecOps alien kills as PvP kills
This leaderboard shoud be strictly PvP or should be expanded to other modes as well.
3&4 . There was a bug some time ago that counted kills in SpecOps. That number is now used to create the “Destroyed per Battle” leaderboard. I confirmed with few players, that indeed - those numbers were generated during SpecOps.