I think that the Fourth would be an awesome surprise to Madara considering the Fourth's powers and abilities. Although some of the fans say that the Fourth couldn't be summoned because his soul is trapped in the Death God when he sealed the Kyuubi in Naruto. But it hasn't been proven yet.
Hashirama Senju and Tobirama Senju "summoned by orochi" = soul consumed by shinigami Hiruzen Sarutobi - soul consumed by shinigami Minato Namikaze - rather than inside the shinigami's stomach, and leave behind some of his life energy to act as a fail-safe Orochimaru - soul trapped in dreamland
Izuna Uchiha - he was my first bet, but looking on how madara was visibly disturbed on the 6th casket.. ummm.. *confused* ..but still there is a chance since the Impure World Resurrection = soul + memory + ability.. Danzo - no thanks Jiraiya - reserved for naruto in the battlefield Sage of the sixth path - possible.. hoho~ imba~ XD madara's 1st/true body - XDD
"Listen carefully because I'm gonna say this once, I love you" "Ever since I met you, I feel like I've lived to meet you." "I wish I could rewrite my past, but I cant. If I could, I'd do all I could, if it would stop you from crying"