Is there more to it than that? Is IR more of a natural progression or is there a fundamental difference in styles? I'd never heard of IR until I got here and saw the almost cult following it has.
"IR" (as a phrase describing efficient release) is a term often used in the DFP dialect. Common teaching of the release motion uses terms that are proving to be inaccurate based on study of high level mechanics in slow motion. The phrases/terms: hello elbow, wrist snap, straight arm, faster arm circle, slam the door, fingers behind the ball, and a few more, are slowly becoming old school.
The reality is that high level mechanics have always used internal rotation, whip, etc. It seems foreign to many because the old terms have become so ingrained, even at the highest levels. The more we look to slow motion video of high level pitchers, the more apparent it's become that the some of the old teaching is pretty far off.
Once you take a look at a few videos of high level pitcher in slow motion and compare what you observe to the old terms, you'll hopefully start to see that what seems like the cult following of an alternate style; might not be so strange...
Now, that said, just don't go down the hall on the right and enter the 3rd door. Really. That's where the DFP Illuminati perform the rituals. Really--don't go in there.
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