Carriers can work on an island map. It is in fact the ultimate composition vZ, and the only one I can think of where P can manage a supply deficit to a win consistently. Yes, you lose all map control, but your focus are the islands, your natural, and counter drop measures in your main. Reavers are great for all those things. On Roaring Currents, I would play this or proxy 2 gate. I would not play standard.