I also remember seeing something by Rick Pauly where he said he believes 90% (or something like that) of power comes from the 12:00 position.
When I see this 10% concept referenced on this site, that’s also what I think of. I’ll see if I can find the links to the old threads, but my recollection is that Rick observed (I don’t know if he would call it a “study”) that his efficient pitchers could achieve 90% of their peak velocity from a K position. That’s somewhat (maybe a lot) different from saying the lower half only contributes 10%; there is a lot of lower half and core involvement in just throwing from the K position.
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