That is the way to do the Chief.
Last time I did this, after 3 and 2 I looped back to Slhanney, then closed the loop via Indian FSR down to Mamquam. There is also direct descent from Slhanney to Mamquam FSR but too steep & difficult at least for me.
How did you find this bit?
Ledge is fine but I had problem pulling myself up, even with a rope. Don't think I'd be able to do it free hand