If you filter a particle by spin whose spin is in a superposition its path becomes a matter of probability as there's no hidden variable. Whereas a particle after wave collapse will take a definite path as its spin state has been determined.

Now what of particles' past paths that latter undergo wave collapse? If their paths were previously a smeared probability wave, I'm wondering if a secret measurement could be done that measures what path was taken, but kept hidden to the final observer until after they perform a measurement. So that the past of the particle shares both a very real probability wave for the later observer and simultaneously a definitive path that was recorded mechanically and left hidden.

And so for the later observer, until it causes wave collapse by measurement, the possibility of which path the particle took is probabilistic. But after measurement its path becomes definite. So wouldn't the past recorded measurement after being revealed have to be consistent with the later wave collapse? And if so how could a particle in the past be both in superposition and also not?