Montpellier had huge problems with injury. French NT MB Franck Laffite picked up heavy knee injury in 3rd or 4th round and season was over for him. Starting from December till mid January they had huge crisis with injuries. Libero Daniel, French NT OH Lyneel, OH Quesque were out due injuries while Duhagon and Gromadowski were playing despite slighty injuries. After Lyneel and Daniel returned they won 4 out of 5 matches, including Poitiers and lost to Cannes only. So reason for their position were injuries not lack of quality or poor form.
I never say nothing about "poor form" or "lack of quality". I wrote that club was not doing well based on rank in a table. Actually, I don't watch French league so my answer for Martee wasn't very concrete But as I can see you have information about the topic above so thank you for sharing