I find this discussion of editing the briefing scene, kinda pointless. We all know Ady will NOT be changing this.
Personally I have never had any trouble with this scene. Leia IS a leader of the rebel alliance. She has military experience (4 years with the Rebels).
It is never stated who came up with the tacitical plan anyway. Leia is just the one briefing the pilots which needs to happen anyway. Perhaps she consulted the Generals.
It is fine the way it is.
Matticon