I honestly just picked a few random guys to show that 5 stars, 4 stars, and 3 stars can all be alphas. Had to include Nelson, because he's on My Colts now.
But to your point, guys are rating players, and quite honestly, they are becoming good at it. However, I think the 5 star label can be a little silly.
For example:
Would you rather have a 5 star WLB or a 4 Star QB? In most scenarios, you would want the QB.
Would you rather one 5 star DE or three 4 star DE's?
Would you want a poor culture fit, even if he is a 5 star?
Is the last 5 star player significantly better than the highest rated 4 star player?
There are 100s of these scenarios that could be discussed.
Recruiting is simple, it's about balance and aquiring as much talent that fits your scheme and culture.
So to me, ND's future doesn't rely on the be all end all scenario of, gotta get 5 stars to compete.
ND needs to simply find the 2 to 3 difference makers they can add to what appears to be a very solid and strengthning foundation.
They have to do that through a variety of channels.
Better talent evaluation.
Better player development.
Increase in recruiting 'wins' in tougher competition.
Finding great culture fits.
Becoming more cut throat on over signing.
Getting less unwanted transfers/players leaving/kicked off
And yes, landing 5 stars when available