I haven't rewatched it but from what I saw on Saturday it looks like Miller's lights went out. Probably got tingly arms and legs which was cause for all the stretcher stuff. I'm glad he is ok.
No reason to risk him being injured for good by bringing him back too soon. This season is basically over anyways. He can be a leader on the sidelines. Thank god the kid is okay!
Sucks for Collin's Nebraska career to end like this. I know he can potentially return for a 6th year, but I would think most guys like him would just want to move on.