It sure the heck is. Yamamoto was one bright guy, surrounded by a bunch of not so bright people. He never wanted to take on the US, was against the invasion of Manchuria, and opposed the tripartiate treaty with Germany and those other misfits.
BTW, the battleship Yamato had 2 sister ships, the battleship Musashi , and a third keel laid which was turned into the supercarrier Shinano, which was sunk by the US sub Archerfish. I haven't found anything stating the Shinano has been discovered yet. It was supposed to be the wild card for Japan to pull out of it's hat late in the war, when people knew Japan would lose already. Perhaps married with the Messerschmitt Jet fighter Hitler sent over, Japan could've dragged out the war long enough that the US would have opted for different peace negotiations, who knows.