@TTex600:
I totally follow what you're saying - however, the idea that the systems weren't relaying useful information (in that it could be processed by the flight crew) simply does not square up with the PNF saying "We've lost the speeds" at approximately 02:10:15 on the CVR - at least to my mind.
And I'm not trying to analyse you or anyone else. The fact is that every airliner from at least the '60s onwards has had some form of electro-mechanical device between the raw data and what gets displayed on the instruments - whether that device is as simple as a three-way switch or a more complex setup, such as a digital voting mechanism.
No matter how old-school or modern the system, the onus is on the crew to work around the problem and try to overcome it. The gradual shift from steam-gauge to digital technology has altered the nature of the problems to be solved - that much is certain. Also certain is the fact that the accident rate has consistently come down since the introduction of the new technology. What is less certain is how to approach the new problems that raised their head in that time.
I don't think any of us will get a satisfactory answer as to why the PF pulled up. Because his display was not recorded and because he did not survive we will never know conclusively. From my point of view, even if the pull-up input was triggered by something he saw, far more important to me is why the PNF did not feel he had the authority to command the PF to hand over control while he was waiting for the Captain, and to a lesser extent, why the Captain did not delineate the parameters that would have given the PNF the confidence to do so when he went for his rest period.