What purpose does Sasuke going to Orchimaru actually serve the series. The entire point of Sasuke giong to Oro is for Oro to take over his body. Other then probably the mangekou abilities, Sasuke has a fully developed Sharingan. Why would Oro train him up endlessly if he just wants his body? He doesn't need Sasuke to know powerful jutsus, just have his bloodline ability developed. If Sasuke goes over to Oro, ya might as well justkill the character.