For sure. They didn't throw another big guy on the team b/c there just isn't a premier big man defender anywhere to be found. So much of the international game is played in space and they have to be able to go out and defend a 6' 10" on the perimeter.
They need better shooters than they have. And who will be the leader of this team? That's where they will struggle, if they get down, who takes over the game. Melo, Bron, and Kobe all can but who will they go to? How you gonna get two of those guys to be roll players?