Well, that's a rough comparison considering that Nagato had his whole life to master it. Plus, what you're describing is the Sharingan, not the Rinnegan. Very different Dojutusu with how they both work, and even then, what you said is also not always true for the Sharingan. Kakashi for example took years to realize his Mangekyo had been awakened. Honestly, from what I've seen, all Sasuke did with his Rinnegan was copy Madara's Six Paths techs and use them himself, so that doesn't really speak much for Shinra Tensei and Bansho Ten'in either. They are both originate from the same Deva Path, but take that out and they're not connected at all in terms of how to learn them, so I find it hard to see Sasuke knowing the more basic Deva jutsu automatically because he knows Chibaku Tensei as an iffy argument. Especially when Madara never used them despite having access to that very jutsu.
