I think what you are saying needs to be brought as a suggestion - improving draft peeks.
It is going to be my third draft, and in my first draft I've picked a great prospect that develops great, and another that is also very good.
So, I cannot say whether your claim is true or not.
What can be said is that the draft maybe needed to be adjusted per league.
Meaning that an higher league get better (more prepared) players.
It as its flows, as it may give an extra advantage to the teams in the higher leagues, but maybe there is a way that it would work.
For example - the better prospects in the lower league's drafts (while more ready and mature players in the higher league's draft) and so on.