As I've said before, all the other high speed crashes show lots of debris from the air. They didn't have to dig them up far from the curious eyes of onlookers. They were visible all around.
Your argument is "this is a first."
How's this for a first:
-conspiracy targets rural grass for no fathomable reason, raising the 9/11 death toll by a hefty 2%.
-To convince everyone of a 757 crash, the forces that be tried hard not to make it look like a typical 757 crash.
-But they did this is such a way that the crash experts at the NTSB renowned for their crash expertness were easily fooled, every last one of them.
-But an admitted non-crash expert through his admitted non-crash expertness, and on only his argument this has never happened before can determine with absolute certainty the crash scene was staged.
-They managed to convince the 1100 recovery workers that a 757 crashed at the site, not a single one reporting any anomalies.
-Then they decided to plant numerous fake witnesses who reported seeing the plane itself.
-Then they decided to either create fake relatives by the dozens, or dupe fake relatives by the dozens with an unproven form of voice technology, also a "first."
-Then they faked the DNA
-Then they faked the radar tapes
-Then they faked the seismic stamp of the event
-Then they faked the black boxes
-Then they convinced everyone at United Airlines the flight never existed.
-Then they said to themsleves, "Wow, the death toll can now rise by a hefty2%."
-Now take F93, and multiply these unlikelihoods by a factor of at least 4 (3 other staged events) and by all the trouble to wire three buildings with explosives, causing another "first": the controlled demolition of 3 skyscrapers taller than any previous demolition.
-These events happen in broad daylight for maximum media documentation.
Which of these two "firsts" is more plausible to you?