What was in the 6th coffin in Naruto

In Naruto, when Kabuto conjured the sixth Coffin to terrify Obito and demonstrate his might, it included Madara Uchiha. When it came to knowledge about a wide range of topics, Kabuto was an expert.

How do you guys think Obito vs these 5 edos and possibly Kabuto

The Sixth Coffin by LordSarito on DeviantArt

What was in the 6th coffin which Kabuto summoned in front of Tobi

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What was in the 6th coffin that Kabuto summoned using Edo Tensei

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Madara Uchiha In Kabuto's 6th Coffin

What was in the 6th coffin that Kabuto summoned using Edo Tensei

Obito and Madara by Climbintospace on DeviantArt

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Why was Tobi terrified on seeing the 6th coffin? I know it was