Wasted Time.
One of the points raised by the recent evidence is that when they moved to the recent search area, they inexplicably carried out a patchwork of searches, leaving big gaps. Surely, logically, the first searches should have been along that areas section of the known position arc and parallel to it. Had they done so, then as it now transpires, time would have been saved. More logic, less scatter-gun.....
Maybe they should have had a little more faith in the basic data upon which their search was predicated.