In that case I can only think that Madara's Susano'o resides up his ass, thus allowing it to be pulled out without any eyes courtesy of Ass-Pull no Jutsu.

Meanwhile, Tobirama is shown to be a total dud despite having killed off Madara's younger brother, who was said to be Madara's equal.

The only way around this problem of a Uchiha/Senju fusion that Madara represents is for Naruto to get his hands on a Sharingan or Sasuke to get some Senju DNA quick time. If Madara manages to entrap the bijuu's again then it is goodbye to the whole planet.