Well, I do have 10 years experience(USAF and Commercial) working on Aircraft, from engines to fuel tanks and even on the "black box\'s" (C-141, C-5 planes).
Take that as you will.
A Catastrophic faliure of an engine would NOT cause that type of total structural failure.
For a series (2 to 4) of catastrophic failures to all happen at the same time (more or less) is somewhere on the scale of 1:1,000,000,000,000 odds.
Engines can take SEVERAL birds and still at WORST only "flame out". At which point the crew just kills that engine with the suppresion system. That still leaves a whole lot unaccounted for.
(Oh, and knowing what I do about feul systems, and internal wiring of the tanks, the TWA 800 "chaffed wire in the fuel tank" theory is just about as absurd...... but that\'s another story)