-Bob Elliot is still on staff and will still make an impact with this team in that role. I don't necessarily see this as a negative unless it's a serious health event in which case prayers to him. While the secondary has been through like 8 coaches in 8 years, I didn't view Elliot as a long term answer anyway. Booker has experience with Diaco's D and will likely fit right in place.
-KJJ, under the direction of his father, is making what I consider a very smart move that will hopefully improve him as a player and person. After his injury he was likely to redshirt this season anyway, so it's not a huge loss to NU from a talent standpoint. Hopefully he'll be back at winter break with a renewed vision of the man and player he wants to become.
-Simmons situation is purely a product of fit and depth chart imho. Attrition happens.
I personally don't view any of these as awful news or a step back in the program in the least.
If anything, Coach Riley is earning his stripes right now, and is doing a commendable job.