It's a tough list because the worst Riley losses confirmed we weren't moving past Bo, we were plummeting back to Callahan 2007 Nebraska football.
But the Frost losses might have felt worse because he was Scott Frost, and if he couldn't turn it around, who could? I think the talent question took a hit in last year's Minnesota game when a middle-of-the-pack Minnesota team down to its third and fourth stringers outplayed and out-coached the Huskers, including our Junior quarterback who had been a Heisman hopeful just two years earlier. It felt impossible to have a conversation about forward motion after that game.
The turnaround is still coming. Statistical probability says it has to. Of course I'm rooting for Frost, but can you imagine someone in 2018 telling you: "just wait until Year Four when Scott gets some real offensive linemen in here — we'll have a very good chance of going 6-6."