it's a little bit more difficult than injecting blood xdIam thinking that yamato has first hokages dna and his blood can be taken and injected to others so that they can possess senju dna and place rinnegan in them.If it is a sucess then it will be more helpful to konoha.
**** rinnehax, nuff saidIam thinking that when naruto defeated pain bodies the bodies have rinnegans.So where the heck these bodies are gone? and the konoha people should have to store those eyes and try implanting in others to see what it can do? Don't you think so?