Here is something to think about. What if Nobunaga lost both battles Akatsuaka and Kayatsu in 1552? Nobunaga's plans to unite Owari would have been different. Billy Cody has an interesting theory. "Had Nobunaga been defeated with his aid (Imagawa Yoshimoto), there is little doubt that Imagawa would have incorporated the Oda territory into that of his own, or at the very least would have been able to influence internal matters there considerably." p. 156. I will respond later.
Cody, Billy J. Hyoe Murakami and Thomas J. Harper (ed)., Great Historical Figures of Japan. "Unifiers of Japan Nobunaga, Hideyoshi, and Ieyasu," Tokyo: Japan Cultural Institute, 1978.
I did not put that sort of information in my book Okehazama 1560. The reason why is I wanted to explain Nobunaga's victories with an outnumbered army. He was able to win with less.
Nobunaga no Tame!