Heck, Bo had no clue Ganze had a concussion in the bowl game his senior year and he still doesn't hardly remember anything about the game. Isn't that pretty close to what Hoke is getting crucified for?
I think a lot of it has more to do with the current atmosphere. First, there is a lot of news being made about concussions in football and the NFL, NCAA and NFHSS not doing enough to protect players from and prevent concussions in addition to substandard treatment of concussions for football players.
Second, was that the Quarterback showed VERY visible signs of a concussion and was never taken off the field or checked for a concussion. Add to the fact that the entire staff apparently missed obvious signs that the hit could have been a major potentially life threatening injury is just inexcusable.
Coaches and trainers will miss injuries, it happens. But to miss what was VERY obvious tells is what is making this a story. After watching the video there is no way to justify having the QB in after that hit. One could even argue that with him being as badly injured as he was before the hit, he probably should have been pulled long before that.
Difference between Ganz and Morris was that Nebraska actually tested Ganz for a concussion and he passed the test (which is one reason they use much tougher tests now), with Morris they never even had the common sense to test him for it.