A 65-year-old man presents six months after a left middle cerebral artery territory infarct from atrial fibrillation-related embolism. He has persistent right hemiparesis with spasticity, hyperreflexia, and contractures. MRI shows a chronic infarct with linear T2 hyperintensity extending from the posterior limb of the left internal capsule through the cerebral peduncle into the ventral pons and medullary pyramid, following the anatomical course of the corticospinal tract. The structure marked **C** (Wallerian degeneration of descending corticospinal tract) demonstrates this pattern. Which of the following best describes the temporal MRI evolution and clinical significance of the process affecting structure **C**?
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