After watching multiple videos of this team in different scenarios I can tell you they are incredibly hard to rout. Also I'm almost certain that orbs only despawn after a set time and are not despawned on death (the only reason I'm not saying 100% is because I don't have a video or source to reference).
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Despawn orbs on death would be good tho right? And you are only seeing one side of this i.e. the vids they succeeded on. Media is a lie, remember that.