Um sure, but the point was that people were supposed to understand that the use of "We" implied a decision process and not case of vassal states doing as they are told. As you have stated unless you are part of the process it is not enough in itself to provide that meaning.
Oh, I thought you meant "How do we know it's really meaningful and not only a self-aggrandizing way to write".
Of course he's the leader. Duh.
