Blane (my Roanoke homeboy) is using different materials. The GC, he explains, is simply a new style of fly, not a pattern. You can tie it with any material that can be stacked, spun, or wound, and depending on how you form and shape the head, you can change the action (wide wobble, bigger arcs of movement, etc...).
I have been using EP fibers, because that's what I have laying around. Blane uses
an either preformed or custom made brush with Steve Farrar's DNA material. He has also tied them entirely with flashabou brushes, as well.
As a note, when it comes to catching muskie on a fly, Blane is likely one of the two or three best on the planet, so if he's using a mono loop, you probably should, too. If he tells you grass is going to turn to cheese, you go buy crackers.