Two of our esteemed mod makers in the community (Gambo and Spritze) have made a database that you can use which will add players based on their professional debut (i.e. when they were drafted or signed internationally). This is fundamentally different than the historical dbase that comes with OOTP, which adds players based on the major league debut. The thread for it is below; I think you can download it from PadreFan's site (linked in his sig in that thread). I think this might give you what you want, real players that still need developed.
http://www.ootpdevelopments.com/boar...e-gambodb.html
Personally, I have never used it but a lot of people in the community like their work.