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Could it be the age of the scar tissue? Older more entrenched tissues could be more difficult to reverse, while the newer ‘deposits’, those in the greater than baseline 1000 for instance. Could it be the low-hanging fruit (younger scar tissue) is easier to pick than the stuff way up in the tree (older more entrenched scar tissue)?

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Almost certainly correct. Scar tissue as it's forming hasn't gotten to the hardened fibrotic phase yet. Once it's gotten to that phase it's almost certainly irreversible.