So I am curious about both of their arms missing with the sun and moon seals on them since they were suppose to put them together to release IT to release all of the shinobi. No I can see the symbolism of there blood being together at this time could possibly make the effect but I am not sure if that is really the case. Now we saw in earlier chapters that Naruto can regenerate people body parts but that was using the hand with the seal. We do not know if he can do this with the other hand or not but we do know he does not have the chakra to accomplish this currently. If it happens to be that Naruto can do this than I would assume he will get chakra from Sakura or possibly other tailed beasts to do it. Thoughts?