With knowledge we have of how the 8 gates work and the power boost a user gets...Where would you rank the villain from Naruto Shippuden the Movie: Bonds with that knowledge applied.
Body Revival Technique, which grants tremendous self-healing might, with the Dark Chakra, Shinnō was able to transform into a superhuman body that can freely access his chakra without hand seals or any apparent effort of chakra build-up. This grants him great raw physical strength, demonstrated when he brutalised Naruto with punches that sent him flying all over the room and shattering the rock structures from impact, as well as incredible speed that made it look as though he was teleporting to Naruto's backside. This form manipulates the understanding of "Destruction and Rebirth" of muscles that makes it stronger to increase the body's strength. He was even able to unleash Dark Chakra in forms of powerful widespread or condensed shock waves or bolts for tremendous internal damage and claimed to be able to freely access all Eight Gates without any drawbacks as long as he still had access to enough Dark Chakra.
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Body Revival Technique, which grants tremendous self-healing might, with the Dark Chakra, Shinnō was able to transform into a superhuman body that can freely access his chakra without hand seals or any apparent effort of chakra build-up. This grants him great raw physical strength, demonstrated when he brutalised Naruto with punches that sent him flying all over the room and shattering the rock structures from impact, as well as incredible speed that made it look as though he was teleporting to Naruto's backside. This form manipulates the understanding of "Destruction and Rebirth" of muscles that makes it stronger to increase the body's strength. He was even able to unleash Dark Chakra in forms of powerful widespread or condensed shock waves or bolts for tremendous internal damage and claimed to be able to freely access all Eight Gates without any drawbacks as long as he still had access to enough Dark Chakra.