So why make it even more difficult then it is for the moment? 4 and 5 star potential is way better then 1, 2 or 3, but saying that only 5 star potential (= top 20% of potential rating) is all star or better doesn't make sense at all. Fact is that you can't ever be sure, because you don't know for sure what the specs of your draftees were after you drafted them.
You are right. My suggestion, while possible, is not exactly the most logical way to arrange it. Apparently the pools just draw less players in the 5* talent range.
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."