^i still think they're working for Ben, like his encounter with Ilana, seemed kind of like "Hey what's in the case?" What he really means is, "hey is everything going to plan?" "Ok, you have a nice day!" means "OK! Carry on!" do you know what I mean?
I doubt their infected by the sickness, because for all we know now, that's Smoke Monster's doing, but who knows.
Another possibility is that they could be working for The Economist, don't remember if it was confirmed if The Economist was actually Charles Widmore.