Well maybe if you export the Skeleton Mesh from the Meshes.bsa and then you could open it up in a 3D program but then I'm lost, I don't know how to animate.
The vesion I was told is to export the skeleton then in blender animate the skeleton and export it as only a kf file then open the skeleton in nifskope and attach the kf file, but this never works for me in Oblivion only in nifskope