I checked with Lukas, and he said those guys are in the main OOTP database.
Markus had this to say:
Quote:
Basically I have programmed an algorithm which selects about 60 players for each organization. The 25 man roster, most folks from the 40 man roster, about 15 prospects and then some injury replacement type of guys. So, who gets selected is up to the AI and the way players are rated, they are not hand picked 
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So there's your answer.