Why would they even be alive? The SO6P himself showing up is a lot more believable than either of his sons showing up out of nowhere.
It's got to be someone that we have seen before, otherwise when he is revealed, there's going to be confusion and people are going to complain. All we've seen of either of them is literally one panel. It's like when people thought Tobi was going to be Kagami Uchiha. The dude literally had like 1 panel of manga time yet people were convinced it was going to be him.
Kabuto was a good guess at first but in one of the more recent chapters Karin said the chakra felt evil, or something along those lines. This makes me think that it probably isnt Kabuto, considering he was trapped in Izanami and the only way for him to get out was for him to acknowledge their true self or whatever.
Though I wouldn't completely rule him out yet.
oro and co. seem to be in a rush in order to save Sasuke. This leads me the believe it must be someone evil. Honestly at this point I have no idea who it is, but I'm already tired of waiting. I hope it's revealed next week....
