Noblesse Oblige.

Now that Madara has declared war, the Kages formed a Shinobi Alliance to combat Madara, Akatsuki, and his 7 Bijous. Tsuchikage also urged to use the Hachibi and Kyuubi in this war, but Kazekage warns that it might be a trap to lure them out. Since Danzo fled from Sasuke's attack, Gaara promised to relay what has happened to Kakashi. On Raikage's end, he will send Samui's team to search out Kirabi now that they know he is still alive. Chojiro adds that everyone should be careful of Kisame, who possess tremendous strength that rivals that of a Bijou.

It switches to Naruto who is practicing Sage Mode in the snow, and Sakura just arrived to talk to him. We also find out that Kirabi is in some forest rap-battling with a random person. However, their session is soon disturbing by non-other than Kisame. Get ready for another fight! =D

Now considering the two sides of the war,
Madara's side:
Madara
Akatsuki (Kisame, Zetsu)
Taka(Sasuke, Suigetsu, Karin, Juugo)
Bijous (1, 2, 3, 4, 5, 6, 7)

Five Great Ninja Nations' side:
Raikage (Samui's team and others)
Tsuchikage (Jounins)
Mizukage (Chojiro and others)
Kazekage (Temari, Kankuro, and others)
Konoha (Kakashi, Yamamoto, and others)
Jinchuurikis (Kirabi, Naruto)
Samurais

Just looking at it, they set it up so that Naruto is the only one capable of effectively opposing the Mangekyo Sharingan. He's got Sage Mode and Jinchuuriki chakra going for him.