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Jeff,
Don't confuse pro level with MLB as they are often very different animals. In general when we refer to pro ball mechanics it's the two or three umpire system in Rookie to AA. AAA uses a hybrid three-umpire system with some differences based on preparing umpires for the four umpire MLB games.
With the exception of enforcing the safety aspects (FPSR, etc), I can think of virtually nothing in the way of two umpire pro (PBUC) mechanics that are not relevant to the amateur level. CCA is very close to what is actually taught in school & PBUC (The red book is way behind).
Jim
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