Okay, fine, dynamics:
In the
East Granby, CT incident, mentioned above, an MD-83 cut a trough eight feet deep and 290 feet long in the forest two and a half miles from the threshold. In addition to losing both engines, there was damage to various aircraft parts, including the horizontal stabilizer, and leading edges of the wings, and scrapes/punctures to the fuselage. No damage was reported forward of the front wing spar.
So a descending MD-83 could very well strike tail-first. And the Uruguayan Fairchild CFIT hit wing first, which sheared off the tail.
As for no signs of slide, we don't have a photograph clearly showing the wreckage according to the direction of travel, and what photos we do have, suggest that it
did slide to that position. The IHT photograph shows the wings and attached fuselage having come to a rest at a 45 degree right angle to the direction of travel (right-to-left in the photograph). To the right you can see a tree that has been knocked over, and you can see the black streak going off to the left where the forward half of the fuselage continued traveling and disintegrating.
Once metal hits terrain, all kinds of complicated dynamics take place, and even to make an educated guess, we'd need at least some larger view of the terrain and direction of travel. But I don't think we can say that the evidence points to a "low-speed" impact.