User blog comment:Soulreaper1234/Urahara says Fusion Aizen says Subdue/@comment-1853786-20100515095853

I'm pretty sure "taken forcefully" counts as stealing, but anyway why did he put it in Rukia who was going to go back to the Soul Society eventually and would have been in close contact with Aizen, when Urahara could have placed it in his Gigai or body?

Though I don't think the Hogyoku is reacting to Urahara's orders.