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I think it has much to do with the reason that before Kukui was canonically married, people shipped him with Guzma, while some say it’s because once something is already canon without that pairing being a culmination of in-game development, there’s no interest in such a pairing since they’d prefer them to bloom into a relationship without them already being canon, hence why they’d rather ship him with Guzma, because of the potential development between both, idk.