our dear CENIPA says it found the TL pedestal but does not show any photograph or any impression about it. And then sends the piece to the potential "wolf"...
The protocol for accident investigation calls for the manufacturer to test/examine the parts of wreckage is very strict and under the supervision of official investigators. Been like that for decades.
Forget the conspiracy theory. Lawyers have a better, more efficient - and endless - way of dealing with suspected system bad designs. Witness the 18 years it took to implement the rudder mods to the 737.