I would agree with egg. Although the map we see published, along with the explantion of each quadrant, is right quadrant (IT), the full understanding of the map requires that one travels through each quadrant, and confirm the experience described by Wilber and others from within that quadrant.
Sort of like getting a guidebook of Paris, reading it, familiarizing oneself with the landmarks, museums, restaurants, and description of the peole and key phrases in French gives you a vague understanding of what Paris is like. But to fully understand what Paris is like, take a plane to Paris, and confirm each chapter by actually seeing the places mentioned, talking to the people who live there, eat their food, and so on. Only then do you get the full picture.
Wilber has often described himself humbly as a mapmaker but has encourage each of us to follow his map as a guide only.
Storch