If they had any common sense, they'd know that it's impossible to have two Madara's.
However, Kabuto hinted that he knew who Tobi was, Oro was inside Kabuto at the time, so it's assumed that Oro knows that Tobi is Obito.
Not sure of Oro told Sasuke off panel when they were walking, it seems highly unlikely. So, Sasuke doesn't know WHO the masked man is, but knows that it can't be Madara at this point.
Team Taka is clueless, aside from maybe Karin, who is a sensor.
I'm curious about what Sasuke might do or say. I mean in part one, I don't remember if Kakashi said his name, or if they read it off the memorial.. so I have no idea if Sasuke knows who Obito even is at this stage.
If he does, I'd like to see what his reaction is. If he doesn't, I still want to see his reaction because all that time before he was acting on what "Tobi" said or suggested. I am also curious as to what Obito's reaction to Minato will be, and what Madara's reaction to Hashi and Sasuke be..
Unfortunately, instead of asking these questions and talking about it. All the threads being made are about pairings, if Sasuke is good or not, or total troll threads (which is sadly the norm here). So Kudos to you for making a thread that gets you thinking about something that in turn makes you think of 5 other things off of it. We need more threads like this.