Here is a good shot of the entire north couloir. The climb steepens after the loose stuff which you can see as a "trail" coming down from the rocks. You can see two climbers at the bottom of this "trail". There is a short section that I would say is as difficult as the final section on Wetterhorn (you can see two more climbers about ready to enter it above the other two climbers a ways), but more loose. Wet rocks or snow would make this quite dangerous. I took this during a snow and sleet shower and had to turn back just after doing the crux because of lightning. Most of the snow you can see is fresh.