I found this very interesting, as well as pertinent to a discussion often revisited around here:
"The logic for applying the normal and usual relationship is that deviations from the normal and usual relationship should be attributed to luck. There is no such thing as an "ability" to hit better when the game is on the line, goes the argument; it is just luck. It’s not a real ability.
But. . . I have held my peace on this for 20-some years. . .that argument is just dead wrong. There are five reasons why it is wrong.
. . . .
I acknowledge that, in the 1970s and 1980s, sabermetrics reached a consensus on this issue, and I acknowledge that I was part of that consensus. But we wrong. We jumped the gun. We should have remained agnostic on the issue until more convincing analysis is done. "