Not going to crap on Polian (or pile on) but certain positions the NFL is realizing there are inefficiencies and RB is likely one of he worst. To the first post, you can see that the "best first round positions" seem to be the ones that almost work on an island: QB, WR, Edge, and LT do not need to have as much "synergy" with the rest of the team as other positions. Arguably the two positions that seem to have the "most synergy" with the "team concept" are the ones who are the most devalued now: LB and RB, followed by the interior O Line and safety positions. That is not to say (as polian suggests) that there are not "outliers" there that disprove the conventional wisdom. Heck, we see players who do just that (Parsons, Q Nelson, Ed reed, etc) but they are examples of the "generational talents" at their position while most competent starters come later on in the draft.
A great RB still needs an at least "decent" offensive line. A good QB can make do with a subpar line (and it needs to be Dolphins 2021 bad or Houston with Carr bad to make the QB look lost). A good Linebacker needs beef up front to be effective.