[ Not Mine ]
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As many of you are aware, Madara Uchiha has become the Juubi Jinchurikki. To become this he needs to seal the Juubi inside him (obvious). He was shown to have sealed all 9 bijuu in virtually zero time. Now how did he do this when the Akatsuki as a whole took 3 days to seal one into the Mazo? This is where the theory begins.
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Madara with his rinnegan & genetic experimentation (performed by Kabuto) is essentially a pseudo Rikoudo Sennin. He was granted Sage Mode via Hashirama's face & Sage Energy on his chest.
We know what impact Sage Mode has on the user, heightened senses, enhanced physical & chakra strength... the list goes on.
I theorize that Madara combined Sage Mode enhancements with a Bansho-Tennin/Human Path Soul Rip (utilizing the Rinnegan to strengthen it) combined with the extra power Hashi's cells provide, in congruity with his own Sharingan/Rinnegan ocular skill. This is compounded by the Uzumaki-like chains (not sure how he got those) that emerged from the Mazo statue. This super-powerful combination with Madara's skill could explain how he sealed all the bijuu at once with the ease he did.
The only questionable thing I don't know how to explain is the Uzumaki-like Chakra chains. Maybe he copied Mito Uzumaki's.?
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:bouncy: What do you think? :bouncy: