This photo is very helpful, except that the line on the photo for P5 confused me as it shows the climb going straight up over the large bulge at the top of the slab. The route description is not very clear for this pitch, but I think the line on the photo disagrees with the written description. When I led this pitch, I aimed for the right edge of the bulge at the top of the wall and went over the arete there. Turning over this arete at that location was easy and led right into what is characterized in the route description as the ramp leading to the belay ledge at the base of the "improbable looking corner".
I agree, you do have to traverse right to avoid that bulge and the line in the photo goes straight up over the bulge. This is the last 30 feet of pitch 5. I was leading this pitch, and it is pretty obvious you do not want to go straight up over the bulge (probably at least 5.9 R).