For the players that I have got no scouting information on I put after my 4 star players as I have a 3/5 chance they will be 3 or above
Your 3/5 chance assumes that the players are equally distributed between 1-5. Is this what is actually observed in reality?
If they use an even distribution formula to determine a players skill then it will be similar to a random calculation.
Think about flipping a coin 1000 times, even though there might be not exactly 500 heads and 500 tails overall the difference is very likely to be small. Natural distribution of odds. ,)