Board Thread:Theories and Speculation/@comment-27075290-20151102051236/@comment-26541067-20151102144954

we dont really know everything about these prosthetic arms,eg whether theyre the same as those used in obito or danzo.tsunade was involved in their creation so they may have been have been altered slightly.perhaps she suppressed the mokuton to make them more stable and limit the chance of adverse effects occurring. also even if the tissue still has mokuton i doubt it can be used actively the way madara or yamato did.also the mokuton in the arm would go crazy when naruto channels his yang chakra,but it didnt,suggesting it may be a more inert version.unless of course naruto has mastered it and can completely control its activation,which again is unlikely. mokuton was considered dangerous to experiment with ,though given the fact naruto is ashuras incarnation and with his yang chakra and incredible lifeforce he might be able to keep the mokuton under control,but tsunade was working on a similar arm for sasuke ,who doesnt have ashuraHacks,and unlike madara ,orochimaru,kabuto etc, tsunade wouldnt go through with it unless she made it safer somehow,implying she further modified the tissue to suppress mokuton.just my theory. theres also the possibility that the arm has mokuton but naruto just doesnt/cant use it.and i lean towards 'cant' because mokuton isnt something you toss to the back row of your moveset