I would love to disagree, but am positive you are better informed.
So, fine, his elbow was simply brought back to snuff, average, whatever. But snuff for Sale was/is better than for most other pitchers. Again I must assert that Chris Sale is more determined and more professional and more skillful than 90% of MLB pitchers.
For evidence of that, we need only look at the current MLB individual pitcher stats. Chris Sale's WAR is 5.5, 3d best in MLB. His ERA of 2.46 is ranked first.
FWIW, in 2014, 10 years ago, his ERA was 2.17, 3d best in MLB, and his WAR was 6.6, tied for 4th. In 2017, his first year with the Sox, his ERA was 2.90 and 7th in MLB, and his WAR, 6.0, was tied for 6th. In 2018, his ERA, 2.11, was not ranked because he didn't pitch enough innings, but his WAR, 6.9, was 6th best.