the manga says that the sharingan is a extension of rinnegan. madra also says that to read the sage of six paths tablets the sharingan makes it a little bit clear, than mangekyou sharingan makes it clearer and finally with rinnegan you can read it clearly. but i want to know is byakugan a extension of rinnegan too? can you use byakugan to read the tablets? and if not than where did byakugan come from??