For the most part, the commercial recruiting services do a pretty good job of identifying the top 3-4 players at each position. When the evaluation process reaches the last spots for the so-called 4-star ratings it becomes more speculative.I think the people that do rankings and their publications are rubbish. Evidently the rankings don’t take intangibles like work ethic, football IQ, film study into account.
You might as well have a monkey throw darts when separating the hundreds of possible prospects into 5.7 or 5.6 ratings or below
In addition to the VIP personal intangibles that you mentioned, IMO there is also a strong regional bias (southern/coastal states) and another obvious bias that favors athletes who play for urban/sburban high schools programs over small town/rural schools.