@martinies,
I think the probability wave in quantum mechanics should realy be called a relative structure wave or a wave of possible structure in terms of left or right. The relativity between left and right or spin up spin down must be the cause. Nonlocality is the cause of left and right and seen as relativity in left right locality. Nolocality without action is left without a right or alternatively right without a left. Locality is nonlocality as a coincidence of right and left.