I dont know if SHGames done this for a reason or if they didnt put much effort into the Perk arrangement but I personally think that putting Toughness,Blast suppressor,Scavenger and Hardline in the same perk slot was a bad idea, I mean what if you want to go on a massive killstreak but dont want people to know where you're using your exo ability or if you want to Go on a streak but have to risk not having toughness so you can use hardline or Scavenger. I think they should have put more thought into the perk arrangement.