In reply to Only a hill: It's a slow afternoon here...
Looking in Voyages dans les Alpes. Tome 4 in the chapter on the traverse there are only four people mentioned:
De Saussure
His son
Alexis Balmat (a porter)
P J Favret (best friend of Alexis Balmat)
Other people are implied as being there to but the latter are only mentioned explicitly because Alexis fell into a crevasse and Favret got lowered down to him to rescue him.