[Trot Nixon's Waifu]

I was wondering if the potential ratings for the hand-made draft prospects of the first three or so drafts were based on Zips as the ratings are for the MLB and MiLB players. If not, what is the methodology behind the current and potential ratings that the devs give draft prospects? This question was brought about by the difference between the Adley Rutschman of OOTP 19 and OOTP 20, with the former having much better ratings than the latter. This is not a complaint, just an honest question about how this process goes. Thanks.