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I've been able to solo Silver matches fairly regularly against the other 3 factions, but I haven't dared attempt it against the Collectors.
And yeah, Possesed anything is just dangerous as heck. I've been on the receiving end of a Possessed Praetorians' homing missiles at least a dozen times by this point, and it's not funny since I'm taking cover or around a corner each and every time, but they still manage to hunt me down.