We should buy lots of Ds.
EDIT: Seriously, the price gap is quite big. 200$ is more than half of another D hull. Size might be important, but if the stats are not THAT great, maybe 2 Ds will be better than 1 E.
Since I have finally set up my internet, after two months without it, and purchasing my hotas I can finally get this game (Later today when I get home, plus download time). Embrace me. Seriously, I have absolutely no idea what to do.
I think the trial by fire is a good idea. Some people like to lead, some don't. So take the ones willing to lead and let them have a chance. If they prove themselves worthy a leadership position may be considered.
As for the Field Commander I think having one is advised, but its true needs will...