Just make sure you go up the RF dihedral to the right of the Au Cheval pitch and not up the dike into the corner that makes up the left side of where the Old Man used to be. Significantly harder than 5.8.
The corner pictured with all the caulking in the cracks is no harder than 5.8, I climbed it a few years ago. There are cracks in the back of the corner with less caulking and pretty straight forward stemming up the dihedral. I think that is the left side of where the old man used to be though.