Okay, to take on several posts at once:
The smoke in the Shanksville pic is lit from above. This tends to give it a bluish appearance, as can also be seen in the pics of the towers where the tops of the plumes are seen. The undersides ,in both cases, are darker. Quite normal appearance for hydrocarbon fuel smoke.
Looking at the 911myths pics of wreckage, the larger pieces, like the section of fuselage with windows in it, are sitting of an area of vegetation that seems to include braken fern and some sort of low-growing basicale. There is no grass visible. This would be typical of vegetation rather far into the woods. It is quite likely that one of those large pieces of debris clipped the two trees cited. In deed, one pic shows them from a vanatage point inside the wooded area, and they do not, to be, appear at all burned. There are broken branches lying on the ground in the lower left corner of the same frame showing oval leaves. Ergo, the woods are deciduous, or at least mixed.
The soil around the engine has all been disturbed. It is being excated with a back hoe. Not a pricision instrument. Whether it was dredged up from a lower level is not apparent in the pic. Thus, it is out of context, to some degree. It is impossible to determine, from this pic in what attitude it entered the ground or what it may have hit to change its direction of travel.
The large pieces of debris appear to me to be from the aft section of the aircraft. This would indicated that the aft portion broke up on impact, which would explain the skewed, light impression of the vertical stabilizer impact. That part of the aircraft did, indeed, bunch into the woods.
Is this helpful in any way? It is all starting to give me a headache.