Syracuse was one of the best teams for two weekends. For the previous four months, they were not. Two good weekends don't mean they were one of the best four teams overall. Not by a mile.
When did Syracuse win it? And Syracuse had a lot of talent on their team.
You're not going to get the 4 best teams in the final 4. Obviously having Nova and KU in the same region eliminates one of them.
The tournament isn't designed to get the 4 best teams into the final 4. Its designed to crown the best team. In the end, Nova played KU and UNC and they beat both of them.