As for an engine seizeure causing seperation........ I doubt it. We practice for this in the sim. The aircraft will fly. Only difference is we shut it down earlier than a "normal" engine failure. Lots of vibration.......YES. Lots of noise..YES! However I cannot see how this alone can, or will cause seperation. However I MAY be wrong!
I don't know what caused this accident, no-one does. I do not think that speculation, however well informed it may be, helps the situation!! Lets leave that to the people who are experienced in that field, and have the evidence at hand!
Eff Oh.