postdict would be a better choice of words than predict

Agree "predict" is inadequate but "postdict" assumes that one followed the other which may or not be the case, as you have said yourself.

Perhaps "prefigure" comes closer to it, as defined thus:

"To suggest, indicate, or represent by an antecedent form or model; presage or foreshadow: The paintings of Paul Cézanne prefigured the rise of cubism in the early 20th century."

It could also be said that Cezanne's work represented an early expression of what was later to be known as cubism.