Actually, the rank of Grand Admiral comes to use from the Third Reich's Navy of WWII where the highest rank was, in fact, grand admiral (esp. in the case of Doitz, leader of the Third Reich after Hitler). The rest of what you said is addressed by Dr. Saxton at his website. You might want to read through that, _Thrawn...he cites his sources. EDIT: Also, I thought I should address the fact that High Admirals are pretty much necessary. You see, Grand Admirals aren't an official rank...if you're an officer in the Empire, you aren't guaranteed to have a Grand Admiral at the top of your chain-of-command, but you are guaranteed to have Admirals, Fleet Admirals, and at least one High Admiral. It's the same thing as the Five-Star officers in the USA's Armed Forces, the rank exists, but that doesn't mean there are any persons of the rank in active duty (or alive) and, therefore, it doesn't mean any given person will fall under the eventual command of a Five-Star. I hope that made sense.