I know people are worried about last chapter manga but honestly Madara has foreshadowed this for quite some time
1) He constantly bragged about HAshirama abilities and coveted them. More specifically the healing abilities which he now has and are > Hashirama's thanks to the merge of Uchiha and Senju
2) Remember he has told Hashirama twice that when two opposing forces cooperate anything is possible
With thse three images and Madara goal's it is quite plausible for Madara to be this powerful
3) Where is it stated in the manga that the eyes cast Susanoo. Manga states those who unlock the powers of both eyes get Susanoo. This means susanoo technically requires ONLY the unlock of both eye techniques and not the use of both eyes. Anyways, you can disregard it but Manga proves you can.
1) He constantly bragged about HAshirama abilities and coveted them. More specifically the healing abilities which he now has and are > Hashirama's thanks to the merge of Uchiha and Senju
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2) Remember he has told Hashirama twice that when two opposing forces cooperate anything is possible
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With thse three images and Madara goal's it is quite plausible for Madara to be this powerful
3) Where is it stated in the manga that the eyes cast Susanoo. Manga states those who unlock the powers of both eyes get Susanoo. This means susanoo technically requires ONLY the unlock of both eye techniques and not the use of both eyes. Anyways, you can disregard it but Manga proves you can.