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I agree with the IP-Leap principle. Shandler came up with this at least 10 years ago, and I use the principle in roto. It's not something that came out of nowhere; it came out of BaseballHQ.
Agree that in the ideal, and in the abstract, you'd give a pitcher a transition year.
Only offering the opinion that the IP-Leap principle works better as a strong guideline, than as an absolute. Don't disagree with anything above.