It is indeed a lot of information, and Connor figures if he's really a brother he'll have no qualms or trouble answering any of it. He listens, perking up a bit at telekinesis -- that's a fun one, and he's never known anyone with it, but first things first. His text to the non-recruited members (Altair, Ezio, Desmond, Connor, Giovanni) reads:

I've got a man named Yusuf Tazim in shadow lock at the bureau, claiming to be a master assassin. Does anyone know him?

Once it sends he flicks his bracelet off and turns his full attention back to Yusuf. Master assassin, huh? That makes four... Connor catches himself, realizing he already believes Yusuf and wants to learn from him. And teach him about his Asgard power and the history of the war. He wants to impress the man already and scolds himself as he listens, pulling out another chair and thinning the rest of the shadows keeping Yusuf in place so he can come sit down.

"Konstantiniyye...?" He repeats the name carefully, thinking, then shakes his head. "I know a Constantinople."