Vader and Obi-wan will fight again...
https://screenrant.com/obi-wan-show-darth-vader-rematch-deborah-chow/
It seems their rematch won't break canon so to speak (A New Hope) and he is still learning as Darth Vader. Timeline of the show is about 10 years after Revenge of the Sith. And Obi-wan is nowhere near to be an old man. Luke will only be 10 years old.
Maybe we see Palpatine again, and training Vader. Even in short clips.
That's perfectly fine for them to fight again.
That's make take on it.