What we've learned about the origins of Indo Iranians is one of the coolest things discovered by ancient DNA so far. It is very well documented in ancient DNA. The only part of the story not documented by ancient DNA yet is how they spread in Southern Asia which to most people is the most important part of the Indo Iranian story for obvious reasons. In this link are the arguments behind why I think this is the story of Fatyanovo and their Indo Iranian descendants. https://docs.google.com/document/d/1e...