I think what last night's results illustrate is that the conference has some wildly inconsistent teams. Clemson lost 4 games against teams outside the top-200 this season: one in November, one in December, one in February, and one in March. They lost a 5th game against a team outside the top-150 in January. So did Clemson get better this year? Doesn't look like it. It looks like they just oscillated between excellent (like when they throttled State three times) and awful (5 Q3/Q4 losses spread throughout the season).
Pitt is a somewhat similar story: they had two clunkers in November, then a clunker in January, a clunker in February, and a clunker in March. They had an awesome win over Northwestern in December, but otherwise have hovered in the mediocre range in terms of performance. It's hard to say they have gotten notably better over the course of the season.