This is not SFA where you get some more breaks in the schedule during the season. This is a full contact, every game battle type league. It could also be that it was novel for the first season and 1/2 but coaches are adjusting and so the pressure may be neutralized.
Syracuse's zone D was always built for the NCAA tourney as it was difficult to deal with the first time teams saw it. Once SU moved to the ACC - an entirely new set of coaches saw more and more of it and were able to adjust.
All that being said - we did have a very difficult schedule and that could have mentally worn down the team as the season went on and its difficult to have to rely on Freshman to overcome that.