I'm finding players who are "Discovered" through scoiting in another country end up with all zero ratings when they sign their contract.
I'm just playing as a commissioner so have not signed the players myself, the AI does this. When looking at their stats in the editor they do have ratings but shown on screen is all zeros - see this thread for an example image.
http://www.ootpdevelopments.com/boar...p-history.html