jcjeant. Yes, a possibility of collectively focused interpretation of confusing data. I think that is what existed between the two, prior to Captain's return. A hybrid, though disagreeable "rapprochement" between LHS and RHS.
But, after Captain pops back in, the focus is on him, "What do we do?".
His is the new hope for a solution, and unfortunately, he does not grok the panel(s), nor does he see (relax....) the SS. There is virtually no chance he saw, believed, and acted upon two divergent readings from two separate instruments. His was the 'stuckness' one feels when out of options, let alone decent data.
It takes a leap of uncommon collective hysteria to believe these were three stooges. They were not, they were baffled by a situation that had gotten so far ahead of them, there was not sufficient time to unwind it, and try options.
So, back to square one: 2:09:30. A Flight computer commanding a dive, airspeed reads that were duff from either ICE or Turbulence, and a crew who were not "following" the bird as it lost its way.......
In the absence of explanation for the autoflight command to dive (Zipper), a postulate. The a/c malfunctioned, and the pilots were handed back an a/c that was in UPSET, without awareness of the level of trouble they were in.
Nothing of any sort by way of casting aspersions. This is unaddressed by BEA. How long will this remain the case?