Board Thread:Naruto Discussions/@comment-5413572-20141206200019/@comment-3568954-20141228101029

it says right on this wiki in the Rinnegan

While its progenitor was first seen in Kaguya Ōtsutsuki as the Rinne Sharingan, its true form first manifested in her son, the Sage of the Six Paths

it was said her third eye had the power of the sharingan its not saying it has every power the sharingan has because that is clearly not the case. her eye has the Copywheel power that all common sharingan have but its only powers that it has other than that are Amenominaka, God:nativity of a world tree and Infinite Tsukuyomi

also we do not know if hamura had a better byakugan. for all we know his byakugan was perfect. its logical if hagoromo inherited her Rinne Sharingan to its fullest in the form of the Rinnegan than hamura must have had the full form of the byakugan. just look at this hagoromo had a Rinnegan but indra only had a sharingan so its safe to assume that Hamura's byakugan was evolved like hagoromos Rinnegan. if we are going by what happened to indra"gaining a sharingan that went blind with over use" than it is safe to assume that Hamura's byakugan had no blind spot and all current byakugan have blind spot because they did not inherit all of hamura's power