It's amazing to me that no one has "created" 4-umpire mechanics. I have a set of 3-umpire and 4-umpire coverage handouts given to me by Henry Pollard at the 2002 ASA National Umpire School in Killeen, Texas.
What is more accurate to say is that ASA 4-umpire mechanics were never officially included in the Umpire Manual; and that, when the new regime took over, the broom swept out everything not published to the general public via the Umpire Manual. There are many specific recommended mechanics no longer approved because they weren't ever in the Manual.
That version of 4-umpire still has rotations; any time a base umpire chases, another umpire has to rotate (always clock-wise) to cover that opening. Same as MLB, relative to rotations.
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Steve
ASA/ISF/NCAA/NFHS/PGF
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