A far more likely explanation for the change in his ability was that the brain injury impaired some aspect of how his brain wires disparate regions together in order to communicate. In order to recover his brain had to find alternate pathways to communicate between the various brain regions.
It just so happens that in his case the new alternate pathways work better than the originals.
Its not some weird spiritual/metaphysical thing. He is just the luckiest mofo alive.
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