If you want to get the guy, don't rank anyone who says, "probably won't sign," #1. They are about 50/50 to sign if they are represented by an agent, and almost never sign (I'd say never, but I've seen one) if they are represented by their mother.
Very rarely, an "undecided" will fail to sign. I would not run away from a guy like this if he were clearly the best player in the draft.
All others will sign, eventually.