Worker caste infertility needn't mean there is a complete absence of reproductive organs. Eusocial mammals (the only two examples being the naked mole rat Heterocephalus glaber and Damaraland mole rat Cryptomys damarensis) feature "reproductive suppression," which means infertility is only temporary and one of the workers will replace the queen when the current one dies (the specific one being she who defeats the rest). I'm not suggesting that this could be the case for Oddworldian species, but I have always taken the view that it is probable that for such complex organisms as Glukkons/mudokons/sligs, reproductive organs in workers may simply be vestigial, not absent. Vestigial is not the same as functionless.
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