obito didnt have the rinnegan and he was able to use the techniques.
plus obito had the six path techs in himself while the bodies had there powers.
that's a better way to use the 6pop technique.
Normally i would say ironman...but in the recent comics, ironman has his ssuit fused with in his bone.
So i pick Nightwing, Redhood, Red Robin, and daymian batman (batman 666) in the future would beat batman
sorry i like kakazu too but if u look in the gin&kin fight the mask in the manga/Anime was exactly the same as before and did the same techniques. Didn't get enough panel credit though.