Bush is not as poor of a passer as his rep gets. He's not a guy that's particularly accurate throwing into tight windows but because of their running game and all of the RPO principles he doesn't often need to be. His biggest problem is he doesn't always make great reads and can be mistake prone. Throws a decent ball, though, if given time. He just needs a very clean pocket to set his feet and throw. Good outside pass rushers have given them problems.
Minnesota very oddly kept 2 safeties deep much of the game. Illinois often utilizes 2 backs, with Bush as a third runner. That's 8 guys running at 6 or 7 man boxes. What Nebraska needs to do is crowd the hell out of the LOS, similar to the Colorado game. It'll give up a big play here and there if a Safety misses a tackle, but it applies a lot of pressure to a QB (and offensive line) that's mistake prone. This is a game where Chins needs to shine. He can get very creative with his pressures and this line misses way too many blocks. Their passing game is not sophisticated at all and Bush is basically a one read and run QB. Make them think.