Well, I was thinking that if the 4 hokages goes to war, I am thinking "who" will be fighting "who"? Get it?
For me, I think this will be the match ups:
1. Senju Brothers Vs. Madara
2. Minato(with Kakashi) Vs. Obito
3. Sarutobi(with Naruto and Bee) Vs. The Juubi
In the case of Sarutobi, I...