I want to add, when it comes to positions where just ONE player can make the biggest difference, their can be a huge difference depending on position. One great DB isn't gonna change a team, one great OL isn't gonna change a team, as those positions are more about the sum of their parts. If your gonna get a 5-star stud, where you would want him is either QB or RB, or on the DL/pass rusher, and in a close 2nd, at the Linebacker position. Safety is somewhere between the most impactful and least impactful for potential difference just one guy can make. But say Corcoran turns out to be the best OL in the country (theoretical argument here), it doesn't really matter if the guy to his left and the guy to his right are pushovers. 1 OL can't block 5 guys nomatter how good he is. At the same time take a Suh for ex. , even if your other DL aren't very good, if it takes 2/3 guys to block Suh, someone is gonna get through very quickly.
Also, Darrion Daniels is no Suh, but even take him off our team last year and we might have won 2 games.