your wrong dan didn't give tsunade his spiritualization jutsu he only saved tsunade with it, and after all we cant doubt the five kages, because this whole time they were able to stood there own battle against madara uchiha without none being killed, BESIDES THE FIVE KAGES ARE NOT FIGHTING MADARA ALONE ITS LIKE THERE FIGHTING 2 PERSONS IN ONE. HASHIRAMA SENJU N UCHIHA MADARA. thats definitely hard people taking on the two most powerful shinobi in the narutoverse. did you all expect it would be that easy to seal madara.Plot no jutsu
Dan gave Tsunade his spirtual transformation jutsu, she uses it to take control of Madara and then they seal him.