it was madara's coffin. that is why tobi who is claiming to be madara at that time was afraid of kabuto because he is thinking that his plan will be exposed and that kabuto knows something about tobi and that he is not madara difinitely....since kabuto has the chance to summon madara therefore this will give an idea that madara is already dead and can be summoned using edo tensei,,,,,
It was Madara, there's no way he could have his body anyhow..Edo SO6P ... it will be epic !
who's elder son? the elder son of so6p? i think there is not enough dna to summon him..nor the so6p himself cannot be summoned due to lack of ample dna....just like jiraiya his body was buried on the depth of the ocean and it cannot be recovered thus kabuto doesn't have his dna....
