My post was about tall 18 yr old PFs with Superstar potential. It would be different for a different set of criteria. You are totally missing the point.
Your advice as U 21 manager has to take in starting age, skills, height and potential if you are going to recruit more trainers producing NT prospects.
Generally speaking, mediocre or better JR, OD and Passing on a PF trainee is a Good Thing.
On a Centre, for instance, it is a bad thing to have any JR as it means your player caps earlier than he would otherwise.
I think it's worth me stating here, that I am 100% behind the U21 management team. But, you can always improve.