Sure does look to me, from these pics, like it came apart in the air. The debris field is like it fell thru a sifter. I don’t see a skid mark. And fron seven miles up it still would take five or more minutes for it all to hit the ground. If it had started down before it got shredded that would explain the apparent nine minute descent.
No, it got obliterated on impact, pile-driving into the rocky mountain face.
This is not shocking.
1956 Grand Canyon crash - although that involved 2 planes in midair first. THEN the debris field mostly (except what was damaged in the midair collison) in close proximity on the slopes. And basically, slower speeds.
http://www.lostflights.com/Grand-Canyon-Aviation/63056-Trans-World/4906723_95VsW3