The release of Sophie Pétronin and Soumaïla Cissé completes an operation whose underside remains unclear. Prior to the release on the weekend of October 3 and 4, by the new Malian authorities, a significant number of prisoners - more than 200 years old, according to an al-Qaeda news agency - were presented by Malian officials as well as jihadists. Was the release of the jihadists as a bargaining chip…