Instead of using ropes, folks just chopped footholds. Those steps date from the Anasazi, but may have been enhanced sometime else. Either way they are old and there are no rope grooves there. Actually, if you look carefully many technical slot canyons have moki steps in them. I used to not notice them until I started specifically looking for them. My memory maybe hazy, but, I don't recall using a rope in Davis. Good downclimbers can downclimb the whole slot.