Good point! I see where our graphic can get confusing now because of that description. We almost need a category in between mobile device use and reference / monitoring to compensate for this. We won't want to tell people to use open-back headphones for mobile use on the bus, train, or airplane because of isolation issues. Yet these headphones don't belong in reference, audiophile, or DJ. At the end of the day, picking four categories to classify all headphones in definitely created some dead ends like this.
We'll add in those nicer Grado's in the proper spot and see what we can do about the other pair. A slight tweak to our reference / monitoring description could help clear this up a bit as well.