In particular, I'd have expected Delaware to be in the first group, because so many public companies are incorporated there, and so the decisions of its courts on corporate and stockholder issues have major national importance.
Offhand, I can't think of why MA or TX would worked on ahead of DE. Of course it is possible that the volume of material from each state is a factor...it could be that DE is being done in the first group but has a lot of material so won't finish in 2016. I've never taken a look at the volume of each state's output and so have no idea which state courts handle the most cases.