Re: Who was Bane's brother in the intro of TDKR?
as previously noted, the transfusion was done to make the federales think pavel's body was among the dead. Bane needed his comrade to stay behind because as mayor carcetti noted, 'my flight plan includes dr. Pavel, myself, my men but only one of you'.
They would've expected to find the remains of one militia member, that way it seems like everyone in the plane died and it was really a crash and not a skyjacking. Although forensics might be a bit confused about all the gunshots and bullet holes everywhere.