If rinngan is the final evolution of sharigan why did tobi implant it in his left eye and kept the ms in his right eye???? If its the final form why did tobi need it implanted?? I know tobi know all the uchiha secrets so there has to be a reason.... and pains eyes weren't tobi idc what ppl say no one can have four eyes there's a meaning to the words he said when he gave nagato the eyes.... there's a reason why he didn't take them from the start... maybe at the time he didn't have the first dna to obtain it or something