In reply to Rick Graham:
The 4 routes you mentioned are among the very best alpine rock climbs I' ve done in the western Alps.
I'd say that the Cordier is just as escapable ( Abseil descent along the route, terrace mid-way with easy escape), the Noire South ridge is way more 'alpine', lots of moving together required, not much fixed equipment ( vs belay bolts and bolts on the diff pitches on Salbit), much tougher descent and no easy escapes along the way. Cassin on Badile comes close to the Salbit, although I found the climbing on the west ridge much better, but that's of course always a very subjectiv view
The west ridge is, imo, a very fun route: excellent rock, superb position all day long, not too serious, and the climbing is very good too, with a spectacular summit to finish and a fairly easy descent.
Td for the Noire and ED1 for the Salbit is not taking into account the seriousness of both routes, but merits the same overall grade as the Cordier: Td