@Svarin
Mate, your theory is no more grounded in fact than anything I can come up with. All we can do at this point is wait for the report. I do however expect that if such a transitory software bug was introduced it would have manifested itself many more times than once by now. In any case the "bug" you're talking about could only have affected the displays. By the time they were in Alternate Law, the AP was off and the FCUs could not command a significant change in flight path. On top of that it is down in black-and-white that the elevator and trim movements can largely be explained by the PF's inputs based on what we have so far.
Having said that, like the "wear down fluid channels with contaminated hydraulic fluid -> freeze it -> pump with hot hydraulic fluid" process that finally unmasked the 737 PCU failure mode, this aircraft accident reverse engineering lark is a tricky business.