Why else would he create a senjutsu rasengan if he wouldn't be able to land a hit on Obito, unless he's already expecting someone like the second Hokage to be on the same page as him!
I wonder why Minato or Sasuke didn't notice right away that gamakichi's attack didn't disappear even after Obito blocking it. Only the sensory ninja Tobirama and Naruto saw noticed it immediately. Confirmed! Sensory ninjas are the most observant Shinobi!
Maybe sensors can communicate telepathically or he just believe that Tobirama is the one that knows everything.

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I wonder why Minato or Sasuke didn't notice right away that gamakichi's attack didn't disappear even after Obito blocking it. Only the sensory ninja Tobirama and Naruto saw noticed it immediately. Confirmed! Sensory ninjas are the most observant Shinobi!
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Maybe sensors can communicate telepathically or he just believe that Tobirama is the one that knows everything.
