Yes isolated examples, you understand this concept. Just because you can pick out a few examples of some guys who bucked the odds doesn't change the odds that you hit more frequently with higher rated prospects. Also, ND has had one of the best offensive lines in the country for the last 5-10 years. Thus, any RB that plays behind that line is going to produce more than what his prospect ranking suggests he should. Moreover, outside of Kyren Williams and Jerimiyah Love the rest of the RBs at ND produced in college but never really were a factor at the next level and have had pretty negligible/forgettable individual careers which suggests their individual playmaking/athleticism was limited as per their prospect rating
Also, as it relates to prospect evaluations: I already told you, I'm relying on the industry's collective opinion of a prospect. They do far more comprehensive evaluations of a prospect than you do and they aren't ND fans. They provide an objective 3rd party resource to compare and contrast prospects. Your 1 man youtube highlight film watching operation w/ a heavy ND slant/bias doesn't compare in terms of accuracy.
And lets not act like JLove was rated some 3-star. He was a composite top 100 prospect and one of the highest rated RB prospects ND has landed at the position in a while. And he's playing like it. Which is why we need more high 4-star and 5-star prospects signed out of HS. And although JL was rated as a high 4-star recruit and is playing like a 5-star player--he wasn't some massive miss by the industry either.