I think I get it. The koRan developed faster than the koChens because she was closer to the root of the stalk. Ran decided to force the birth of the koChens so she could give the stalk to the koRan. But it was too early for the other ko's. Ran damaged the stalk when she removed the first koChen, so now the fillings can't circulate (2nd panel) and the last koChen is intoxicating with her own body waste.