One might wonder how Predictive Processing/Coding works when the "cortex" is empty (i.e., at birth). I don't know if this is just armchair neuroscience wrapped in a bunch of mathematical flourishes.
[0] A. Roe, S. Pallas, Y. Kwon, and M. Sur, “Visual projections routed to the auditory pathway in ferrets: receptive fields of visual neurons in primary auditory cortex,” J. Neurosci., vol. 12, no. 9, pp. 3651–3664, Sep. 1992.
PS: I'm not saying that there is uniform initial connectivity. Just, the prediction level units (cortical columns) are unable to predict anything until they learn "something".