From the article: "The question is how much of Nebraska's struggles can be attributed to joining the Big Ten, and how much can be tied to internal reasons. To find out, ESPN spoke to people in and around Nebraska's program since the Big Ten arrival."
I can't read beyond that to get Rittenberg's interviews, but honestly, it's almost all internal. We're on our fourth Athletic Director and third coach in ten seasons since joining the conference. We have no continuity, we're constantly tearing down and rebuilding, and we have terrible roster churn. Contrast that with the teams we're trying to beat for our division: Wisconsin - three head coaches. Iowa - one head coach. Northwestern - one head coach.