First, it wasn't the leadership of the 101st, it was the leadership of that particular unit of the 101st (according to reports, the majority of the 101st is on the move in Iraq). By bigger I mean he could have given away plans of the 101st or something similar which could have gotten many more killed or done something at a crucial moment. In his position (they say engineer, pretty generic I know) he might have a good idea of where they were going or what they would be going after.
2. He may not have had access to plans.
3. Who says he didn't give away information!?