I'll be careful in saying this, but what was often perceived as a look of "cool, calm and collected" may have been misconstrued as "I don't know what just happened."
As for the staff staying with Jalen (even until now, perception wise), there's a reason we say "hindsight is 20/20." This video collection is rather troubling, but it's the collection of his very worst plays, for the most part. As the staff reviewed each week's game film, they also were seeing some of the positive things he was doing. He did complete some good balls at times. He made game changing runs at times. He was generally safe with the ball. And then there's CNS's overall approach to being conservative and not fixing something that ain't broke attitude.
This video makes it look like an easy choice knowing what we know now - after the NC game last year and Jalen's struggles in the spring and now fall camp.