I would give all new Drafted kids an Incomplete, for at least 2 years, before you rank them. Some make adjustments when they get to Professional, some not mature, some from different Countries, not used to our customs. Even missing family could affect a kid. Even College kids should get incomplete, when your making a living against others that are doing the same, different animal.
Tons of variables. Busses, Motels, Food, long new schedule, you have to adapt to.
I think after 2 years, you start seeing how a kid is maturing and progressing against other Professionals.