The card-interaction that triggered this question was:
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P1 has a Sin, Unending Cataclysm on the board, and P1->P4 have a mixture of +1/+1 and other counters.
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P2 plays Fractured Identity, targeting P1’s Sin.
What counters get moved where (assuming P2->P4 wants to put all counters on their Sin copy)?
Would P2, seeing as they control the effect, be able to choose the "order" that the copies are made, and thus have their "enter the board" happen last? Or would all the ETB’s trigger at the same time and effectively split atoms, ‘copying’ the counters being moved, as they’re all moving from the same initial board-state?