We can't. BUT, by using SCEA's most recent update, the data they use should be more accurate, in terms of hot/cold zones.
As for potential, you can use CAPs (all created players have "A" potential) to ensure the right guys get "A" potential and then change around other editable players to utilize their given potential rating.
It's a ton of work as there can be A LOT of switching around try and get the most accurate potentials. It's why so many are clamoring for it to be an editable attribute and also why Knight and the other roster makers deserve so much credit. It's amazing how much time and effort he puts into his rosters.
