User blog comment:Godisme/Double Issue: Kill the Shadow 2 and The Black Rescuer/@comment-1706259-20120627190024/@comment-3547859-20120628040712

If that's so, then if they won't be able to take Urahara's bankai as well (After all, the gained his bankai in the same way Ichigo had) then it might prove one of your two mini-theories. The other one about Ichigo's bankai compression might be not so easy to prove. Anyway, I doubt Urahara would even try to fight with his bankai. The risk is way too high.