Re the discussion with RRR on the FDs...just to clarify, when they re-engage, they synchronize with the current V/S or FPA aircraft parameter, and not with anything that is selected.
For reference - what RRR said was:
The reference to "vertical speed selected" is what the FDs automatically acquired on automatic re-engagement.
We really need to be sure about this, because it will have had a massive impact on what the FD may or may not have been displaying.