Good question Phil!
With the Grammies, you never know. I think PMG can definitely do it and win in all three catagories. Some have derided this and other bands wide appeal. To be nominated in three pretty disparate catagories is a win in itself!! It brings me back to the year when Jethro Tull was nominated for best hard rock or heavy metal album back when "Crest of a Knave" came out! Very, very few people consider Jethro Tull heavy metal, or PMG rock, but while some think it a negative, I believe it is positive when a band has enough talent to cross over aand appeal to audiences other than where it's main apeeal lies.
As I've heard you say, PMG is generally one of the most respected contemporary groups in jazz...that has to help the groups chances.
Paul.