Since Obito and Madara are like the 'leaders' of the villians at this moment I think that if I was them what my war plan would be.
1. Would have Zetsu attack the Villages. Why so? Because all of the shinobi are in one place. And if squads have to go away from that war zone to protect the villages making that Win chances of them a little bit better. (We saw how it was before. )
2. Previous Kages of the villages attack them. Why so? Wouldn't that be badass to have their current Kages VS the Old Kages?
3. Kill Sakura, and Hinata. Why so? Hinata Naruto, Naruto Sakura, Sakura Sasuke *I support NaruHina* and Naruto will go berserk either way.. even if it was Sasuke.