Hi Bear,
Yes, there is some information to be had in the recovery of the fan casings. Fracture surfaces tell much (direction & path). The 80C & 80E engines went to a "soft" containment construction from earlier engines. The casing portion where the fan blades are located is made of aluminum. On the outside of this is an aluminum honeycomb structure that tapers in thickness, thin at the LE, thick in the center, thin at the TE in respect to the fan blade tip. The honeycomb is then surrounded by a kevlar/epoxy protective cover. Recovery of this, if it is still there, might also provide some interesting data.
Beyond what has been recovered must be a list of prioritized items the BEA would like to raise, fan casings being one of many. Time is growing short as the ITCZ will start becoming active very soon with stormy seas and torrential rain squalls. There is always the possibility the FDR may not yield all that would be liked to be known making the recovery of parts and pieces very important to develop the most accurate complete picture.
I find it interesting the respective resting locations of the 4 weightiest components, the engines, the main landing gears (partial wing section attached?) and the nose landing gear. The MLG's must have been influenced by the wing sections during descent in the water. Just some personal observations.