Qavion
No, no....nowt to do with the 'dunnies'. The Flap Control Units are (rather oddly) hardwired to control particular ADPs - from memory, Left (or No 1)FCU to the No 1 ADP and Right (or No 3) to the No 4 ADP. Soooooo ..(for example) if you have a Left FCU failure, the No 1 ADP won't be commanded to run at Flap selection. This is noted in the MEL relief for despatch with FCU failure, where the related ADP must be switched to ON, not AUTO, for Take-off and Landing.