If the root environment is good, the rot on one root will no proliferate. Keep in mind that root death leads to rot, not the other way around.
Supporting Ross' observations, when you move a plant from a dry root environment into semi-hydroponics, we expect to have the old roots die. When they do, they eventually decompose - releasing what little bit of stored nutrition they have - and if your watering regimen is sufficiently thorough and frequent, the little bits wash out of the pot. All with no detriment to the plant at all.
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