Just by curiosity : why not following the usual path when you hike up Incahuasi ?
The blue line showing your path is different from the "normal route".
I was a bit sick of too many walk-up peaks and thought it could be nice with at least some scrambling en route. Logic told me it would be rotten rock up there, but still I wanted to give it a try. When we reached the rock band, we realized it wasn't a smart idea going straight up as the rock was (as predicted) rotten and at the time we were there, it was a lot of thawing going on and that resulted in rock avalanches/falls.
Much better to use the normal route on the ridge.
So, ignore the blue line and head up along the red line/normal route.
Edit: The reasons we went in the couloir at all in the first place:
1. That was the only place where we could find any snow.
2. It was more direct line from the place where the archeologist's BC was locatad. The blue line's starting point should be a little bit more to the right to be 100% correct.