A quick message to ask you to no longer try the 7C arête Appartenance in Buthiers Piscine (or the 26 black for that matter). That's because a prehistoric engraving was discovered next to this arête and it's apparently unique. More info (in French) and pics here: http://www.tl2b.com/2016/11/bleau-ne-grimpez-plus-sur-la-fresque-de.html?m=1 It's barely visible as it is, but in my (very limited) experience the same goes for many prehistoric works (like Font de Gaume in Dordogne).
I don't know whether this will be fenced off or not but I do believe damaging it further is unlawful. If you want to climb a hard arête Partage is just a 2mn walk