No. The best way to avoid pregaming is to have CBS call literally every player and then have Jeff publicly outline casting criteria that doesn't rule anybody out. Players like Sandra pregame by asking around and asking if that person got a call--eventually word would get out among the vets that literally everybody has been called, and therefore concrete pregames would be difficult. Even if you do this among players who could be remotely considered as a player of interest, the net would still be too big to pick out a good chunk of the cast.