They were stopping Hyde plenty once they realized that's all they had to stop.
Hyde Carries by length and Q
1st Q - 6, 2, 5, 9
2nd Q - 2, 2, 3, 8
3rd Q- 18, 6, 3, 11, 10, 8, 12, 6
4th Q- 4, 3
Certainly Hyde needs to be a big part of the offense, but you can't just give it to him constantly and expect it to always work. Especially on obvious situations where they know he is coming up the middle. MSU too good to let that happen. They need to be spread out and threatened downfield for Hyde to be able to get solid yards.
Notice he is pretty much neutralized in the first half. 2 big runs, 2 decent runs, and 4 crap runs. Against MSU, who won't let a big run through, you are eventually going to have to punt with that kind of yardage. This is typical Silver Bullet D, bend but do not break. Eventually he gets stuffed and it's 3rd and long. You have to keep getting consistent yardage, and MSU defense is too strong to not get a good stop once or twice a series.
So what happened in the 3rd Q that made him look a lot better? Let's look at the play before a Hyde big run.
18 yards - play before was incomplete pass to Heuerman.
11 yards - 1st play of drive, but previous drive had Brax pass and Brax run for TD.
10 yards - 1st play of drive, previous drive had 2 passes and a Brax scramble.
8 yards - Hall Rush for 13 yards
12 yards - Pass to Philly
You have to set Hyde up for success. If you cannot get any other offense going, Hyde isn't going to be that productive against a good defense like MSU. If you can, and they need to play the whole field, Hyde can have a decent game. It's even harder when you are also playing from behind, where huge clock-eating drives are your enemy, and a punt after a long drive is disastrous.
Hyde ran on 18 out of 63 plays. Brax ran on 20 (a few were pass plays that he ran on), and there were 25 pass attempts or sacks.
Seems to me that the offense did the best they could against that talented of a D, Hyde maybe could have gotten a hair more, but it's not like he was gashing them every time he touched it.