I respect your opinion....but as someone that has been servicing these aircraft for a long, long time I remain suspect. I shall wait for the report from Boeing & the Asiana flight crew and on-board flight attendants briefings. I might add that that separated engine would barely have any fuel in it internally when the airplane crashed. There is no way that separated engine caused the massive fire damage in the aircraft cabin. For goodness sakes the top of the fuselage was blown off, possibly by an explosion in the center fuel tank caused by the hard landing...or something else. The resulting investigation will tell us if the center fuel tank ruptured from the hard landing. Too many questions right now, and no good answers forthcoming to draw any conclusion just yet.
You intimate you are familiar with aircraft, yet make a statement like that?
There was NO explosion....most passengers evacuated before the cabin proper began burning. There are photos to verify these facts.