sasuke doesnt have senjutsu. senjutsu isnt needed to hurt the actual body of the juubi jinchuriki. obitos body was shown smoking after naruto and sasukes enton rasenshuriken hit.
people need to actually comprehend what minato and tobirama said:
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tobirama says that the attack had no effect, after the truthseekers negated the attack. minato then goes on to say why the attack had no effect. he states even when they work around the truthseekers, he doesnt take damage. he then says that the truthseekers are simply too agile, both offensively and defensively.
even when the truthseekers are worked around, their attacks didnt have an effect because the truthseekers were so quick to return to obito in order to negate the ninjutsu.
also, what sasuke received from hagoromo was six paths chakra, which is not senjutsu. madara created the same chakra and still deemed it necessary to take hashiramas sage chakra.
The smoke doesn't nessecarily imply damage. Rasenshuriken does that, as shown when Edo Madara absorbed it.
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Naruto's Senjutsu Rasengan did more damage to Obito than his attack with Sasuke, which should be stronger. That implies that Juubi-jins are not all that durable when it comes to Senjutsu attacks.
