If Disney made a Star Wars version of "What If..?" what would be some good alternate scenarios to explore? What would they look like?

Personally, the one I would want to see most is if Obi-Wan was killed by Anakin on Mustafar. Would Vader have become far too powerful for anyone, even Luke, to defeat? Would Luke even be able to become a Jedi when it was only Yoda who could have guided and watched over him? When or would Vader kill Palpatine? What would happen afterward? I really think Disney should do a series like this in an animated style like TCW.