Makes sense to do so. In the current situation it is likely that the French are having get enough supplies to their troops to support the fast moving offense, while the terrorists are falling back on prepositioned supply dumps.It appears that the majority of what MN Eider had to offer were logistical vehicles rather than combat vehicles.
The AQIM strategy may well be to just survive and keep the conflict going until everyone else gives up. This strategy would appear to be working in Afghanistan, and may be one of their lessons learned. It would explain why they are so ready to retreat ahead of the French advances, the question is will they infiltrate behind the French and attempt to retake control of liberated areas, or just wait for them to leave when the ECOWAS forces arrive?
And remember, each time the AQIM retakes an area it will be trumpeted in the world press as a victory, but when they are pushed out again it will be ignored.