Tom didn't make his team work harder. He changed his recruiting philosophy, focusing on speedier defensive players and targeting faraway football hotbeds like New Jersey.
Some of that is just revisionist history. Nebraska, under Osborne, and even Devaney before him, were always recruiting NJ. Rich Glover and Mike Rozier are just two of the recruits from NJ, that come to mind, and there are lots more.
It was Florida and Texas where NU wanted to make inroads to in order to get some of their talent. Much like many of the major D1A schools were trying to do.
NU has always recruited speed. NU's rise in the '90s was partly due to the defensive changes made under Kevin Steele's influence. They put safeties at linebacker postions and linebackers at defensive end positions to upgrade the speed, and switched to a 4-3 defense. Exactly what the Florida schools like Miami, and FSU were doing at the time.