Every musician played. If you read the song titles, you'll see when some musicians switch out and stuff. Everybody advertised to play on Death To All, minus the dude from Obscura, played.
Also, Gorguts setlist should be up in a matter of seconds
5/18 Tyler, The Creator/Earl Sweatshirt
6/30 Mayhem Fest 2013
8/26 Black Sabbath