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is none other than Yu Darvish, whose fastball velocity spiked up HARD after TJ surgery (something like 2mph over his previously established baseline).
He got a rebuild and immediately dialed it back up to 9, whereas he'd been nursing things at 7-8 for years before surgery.
I don't think it's Set In Stone that Drew Smyly can't be the guy we saw in the WBC. But I do agree with you that those guys do not appear to exist in sufficient quantity (or for sufficient duration?) to warrant a template/archetype from which to base assumptions on large player sets.