Thom and I cleaned the "vegetated crack" that completes "Oh, I See" (5. and "Sidetracked" (5.7+), at Easter Island. Nice climbs on a lovely day; nasty sunburn (I can't be taught).
Having now led "Oh, I See", rather than just top-roped it, I would say it could get an "R" rating for the slab moves above the "chasm of doom". Assuming your last piece in the small flake above the "chasm" holds, you are still looking at a 20' fall.
Nice climb though. Highly recommended by the "Kings of 5.7".