How does that matter?
In the very first year of one dynasty, I had 13 guys attempt to leave early. 3 via transfer, the rest going pro. Of the 10 going pro, 6 were Juniors. Now I had a good year and these guys are solid players, but how is that legitimate?
One of the Soph's leaving early was Taylor Martinez. A running QB with no passing skill set and who only threw 89 passes ON THE ENTIRE SEASON. I was able to talk him back, but are you serious? First of all, what would he do in the pros? Second of all, he had mediocre stats at best, why would the game think he was ready?
Now I am fine with a few more guys leaving early than in real life since it forces you to recruit depth rather than the top 20 guys you come across, but come on. I had to use an entire weeks worth of offseason recruiting minutes to attempt to talk 13 people into staying with the team. 18% of my football team attempted to leave school early. I was able to talk back 7 of them and one of the transfers I let leave.
Really wish they'd rethink the way going pro/transfer worked in the game. Come to think of it, there should be a ton more transfers from JUCO/FCS that just appear from teams.