Werner,
I have PM`d you with a much fuller explaination of my position. The ECAM warning you talk about came from the Excalibar post maintenance spoiler incident where the spoilers on one wing were de-activated full up. Again, I say that a conscientious comfirmation of the actual displayed flight control surface deflection related to the sidestick movement will always correctly detect any faults. (indeed I once taxyied back in on a B747 when an outboard aileron failed to unlock - as displayed by the SPI)
The faulty CM1 sidestick could only have displayed a) fully correct deflection b) full/partial incorrect deflection or c) no deflection.
In other words a two in three chance of detecting the fault. These check must be done slowly and methodically to avoid `seeing what we expect to see`!!
However you try to `spin` it - the essential control check was not satisfactorily carried out.