Lomapaseo:
Explosive impacts (missiles, bombs and/or uncontained engine parts) impact at much higher velocities (over a range). Thus these holes often have the presence of cratering (adiabatic shear etc.) and/or multiple dissimilar impacts over an area near the hole.
High explosive detonates at around 7000 m/s. An aircraft travelling at 800kmh is doing 222m/s.
Explosive devices are divided into "blast" devices and "shrapnel" devices. The latter is designed to kill extensively in a range of of up to 100 metres or more, from the explosives detonation point.
Bodies end up containing significant amounts of, and discoverable pieces of, metal shrapnel, which can be identified as to their source.
High explosive has to be surrounded by heavy sections of metal to produce shrapnel, that then produces substantial amounts of extremely-high-velocity shrapnel holes in any surface within intended range of the blast.
Metal pieces of aircraft components flying around during the aircrafts destruction at cruise speed are not going to produce the same damage signature as an explosive device containing shrapnel.
A block of simple HE with no heavy metal section containing the explosive, produces only a major overpressure event for often less than 20 metres around the detonation point.
That overpressure event is severe within a few metres of the explosive detonation point. An explosive blast overpressure event, is aided by detonation within a larger "container", such as an aircraft fuselage.
Despite aircraft hulls being designed to shed fuselage skin and to have the frame remain intact, a terrorist just has to get lucky, and have the explosive charge go off within a short distance of a major airframe component to cause immediate and substantial destruction of the hull.
That "luck" can be assisted by careful positioning of an explosive charge, rather than allowing random placement. A charge placed in proximity to an auxiliary fuel tank would produce the terrorists desired result, and terrorists have long ago seen the advantage in utilising rapidly-oxidising aircraft on-board components such as jet fuel, as excellent assisitive devices in reaching their desired aim of major destruction.
A quantity of jet fuel could even have been loaded in the hold as part of the explosive device.
I have carefully examined in slow motion, the clearer video reportedly released by IS (or DAESH), and that video does appear to show a fuel-fed-type explosion, with lots of black smoke, on the lower left about the middle of the fuselage.
I'm now inclined to believe the IS video does show this aircrafts actual destruction. The tail section would likely have been blown upwards and away from the blast, thus no sooting of the tail section components.
Chronos has the most likely destruction scenario outlined in post #1222.
(I am speaking as an ex-military engineer)