Thank you for all your work, Anhojan. Take as much time as you need in polishing this edit.
I don’t question why Obi-Wan left Vader to die on Mustafar since (thanks to this series) Obi-Wan thought Vader died there anyway. As for in the moment of the duel, chopping off your “brother’s” limbs & watch him get set on fire has got to be pretty traumatic, even for a Jedi Master like Obi-Wan, so I don’t blame him for not wanting to do the deed then & there, much less risking smoke inhalation from the planet.
With the final duel here, I have a lot more problems. On top of taking place in a much safer environment, Vader is beaten by Obi-Wan AND basically absolves Obi-Wan of having killed Anakin Skywalker. By not killing Vader, Obi-Wan’s no responsible for all the people Vader will kill in the future. You have to do something to address it.
I think you can include Qui-Gon’s line about Anakin being the Chosen One if you remove Obi-Wan’s line about Anakin being truly dead. Obi-Wan saying “Goodbye, Darth,” will suffice.
Also, I second “Kenobi: A Star Wars Story.”