Zetsu Obito!
Remember WZ said that odito wasn't strong enough yet to control his body an power from the wounds he suffered. The Kirigakure shinobi slaughter was WZ with Obito as host. (Even with Hashi cells) I'm thinking that Obito still wasn't strong enough at that point an Zetsu still had a lot of control on his body.
Uchiha are kind to their own if it's not for power. Godatachi awaken 2TS rather than 1TS which showed his potential in doujutsu prowess was far beyond his own. (Obito awaken 1TS first not 2 from the start) This is why Godtachi was far superior to him at a younger age.
Once Godtachi was in Akatsuki he stated that if Godtachi knew his plans then he'd be dead. He's lucky the God had other things on his plate cause he would be dead if Godtachi had the time to focus on him, an he states this himself in canon manga/anime an in road to ninja.