SS people are getting to watch all the contestants 24/7. By the time they enter, they would have known some of the characters of inmates and their temperaments. SS contestants may become extra careful when dealing with people who don't talk straight on the face and indulge in gossiping.
In the earlier shows, one member used to get this benefit (during false elimination eg Imam Siddiqui) of watching the inmates for 2 or 3 days. But this is not fair to other contestants as they are living in the house without knowing anything about others.
In my opinion, SS members will have an edge over other contestants. But why should they have that privilege?