Gin began the careful process of stealing through Twelfth Division.
He expected Grimmjow's diversion elsewhere in Seireitai, and Di Roy's activities in Karakura, should attract a lot of shinigami attention. Still, this was the area of Kurotsuchi Mayuri's power. No doubt there were cameras focusing on him at this very moment.
Then again, if he was lucky, Kurotsuchi might decide to "lure him further in" to trap him, so that he wouldn't have the rest of Seireitai asking to share. That'd be convenient. Because Gin sure as hell didn't intend to give Kurotsuchi the chance to use any of his little poisons on him. Oh no.
Now, where was that little Arrancar? Between a combination of going to wherever was most heavily guarded, and where Kurotsuchi's favourite labs were, and then sniffing for Arrancar reiatsu, Gin hoped to be able to track him down fairly fast . . .