Well.... its this question again.... basically: rukia had the hogyouku in her before everything happened, before she got the gigai. Urahara did not hide it in the real world specifically. Maybe he knew that rukia would go to the real world, but thats unrelated. Anyway, the gigai was to destroy rukia's shinigami powers so the hogyouku would be destroyed completely. Under normal conditions, noone sends vice captain/captain class people to get a normal shinigami like rukia. Basically, it would have been pretty much safe. Aizen was an accident.
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