To awaken the Rinnegan, can you just get any Uchiha's and Senju's chakra, mix them together and get the Rinnegan? Or do you need Ashura's and Indra's in particular (i.e. their reincarnation's)?
Do you still need to go through some very sad or aggreviating situation to awaken it, or do you automatically get it the moment you mix the two chakras together?