There is three people that work with Urahara. The two kids and the man that is really tall and has a big mustache. I don't know what his name is, but he did some sort of binding on Ichigo while in the pit so that he could not use his arms.

But when Ichigo get out of the pit and revealed his new sword the man said something. He acted as though he was familiar with that sword already in some fashion. And I am pretty sure he isn't a Soul Reaper. I know Urahara was a former captain, but that was about it the others aren't, right? But also Zanputuo's only talk to their owner, and no one else. Right? Even if he did have one, he would not have spoken or hear Zengetsu. The only one that can hear Zengetsu is Ichigo, at least that is what I am lead to believe.

So he must know the sword from somewhere At least he acted like he knew it. Is there ever a backstory reveal about the man and how he came to work for Urahara?