User blog comment:Godisme/Double Issue: Kill the Shadow 2 and The Black Rescuer/@comment-4903773-20120629190046

What probably happened was since they detected Ichigo's Substitute Shinigami they figured Urahara's with Ichigo and decided to call his Denreishinki.

Isn't it weird how for the Quincy to seal a Shinigami's Zanpakuto it has to be in Bankai. It shouldn't really matter what form the Zanpakuto is in, it's not like there are two separate Zanpakuto spirits one for Shikai and and one for Bankai. When Muramasa was freeing Zanpakuto it didn't matter what form they were in.

Do you think they'll be able to use Shikai with a sealed Bankai?

And maybe the reason why Ichigo's Bankai can't be sealed is because he's a Visored or at least he use to, or maybe because of the Fullbring, or because he's still a human, still alive.