The Kamara fellating on here is ridiculous. Yes he would lead lots of teams in rushing. He was also a third round pick that every team passed on at least once, and most twice and some three times. Do you know what it means - it means the college scouts (including the Saints' scouts) fucked up and the Saints ultimately made a great pick. Good for them, it happens. It doesn't mean that every player drafted ahead of him was a bad pick, just like not every player taken ahead of Tom Brady was a bad pick.
And how the hell have the Panthers "failed so colossally to build around" Cam? In the 6 years since Rivera took over they are 58-47, with 4 playoff appearances and a Super Bowl appearance. In that same time period, look at the Colts with their franchise QB. Look at the Jags, Rams, Bucs, Browns, Jets, Redskins, Cowboys, and most every other team other than a select few. The Panthers have not colossally failed at anything. Just because you can't win your fantasy league with their players or the "let's use QBR over wins to justify losing" millennial Phillip Rivers take on life doesn't mean the team is not effective in the real world.