The fatalities and the success might have been related to where in the rooting cycle each plant was... if the successful one was pushing roots or getting ready to do it, it would have had a much better chance than if it weren't... the other two likely weren't so lucky. If my hypothesis is correct, that would be one more bit of evidence that the time to repot is at the time of new roots. Of course this is speculation, since we don't have the other two to compare with.
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