If I understood your question correctly you’re asking what attribute range we look for when we decide what youth players to scout to potentially buy.
For me it’s really easy, I first of all decide the key attribute for that position and the minimum I want for my first team so let’s say I’m looking for a midfielder and the attributes I’m interested in are positioning, off the ball, anticipation, concentration, decision and passing and the minimum I’ll accept to play in my first team is 13 then they youth players I will scout need to have a minimum of 10 in those attributes. The reason is because 3 to 4 attribute growth is common in the game but it’s hard to see an attribute grow by 5 or 6 attribute point unless for physical attributes so there’s no point looking at a player that has 7 in all those attributes because for him to play in my team he needs to grow by 7 points in all those attributes which is almost impossible