The main historic descent routes (regularly used):

1. Uberfall
2. Radcliffe
3. Easy O unroped downclimb
4. Three Pines unroped downclimb
5. Silly Chimney unroped downclimb
6. Roger's Escape Hatch

There were no historic descent routes that involved rappelling. As retro says, the pins in question were more likely an old belay anchor.