They don't have their seals anymore? I do see here that Hagoromo tells them meeting their seals again will end the IT. I think the yin and yang seals are a permanent thing until they die. At least that is how I understand it from this page, considering they haven't lost the seals yet even though Hagoromo has them now too.
if he had received that injury during this fight, that would mean his hand was bandaged for atleast two years.
improbable since he can heal by kurama chakra.
only makes sense if it was a permanent injury (like how an ult. rasenshuriken carried & released in his hands could show damage that may be beyond repair. )
so if it is not an injury then could it be a seal...
not likely sense so6p took back his seals for ultimate CT and another seal on top of the one he just had is bad writing.
Fashion.......no.
two best options are ult. jutsu/clash damage or an event happening in the near future pre-the last.
I really love the idea of #4. That would be awesome, but I think it might either be from the massive combined elements of the Bijuu chakra rasengan, or it is from catching Sasuke's PS flames. LOL. But number 4 would be awesome! :hooray: