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Duel takes place on neutral ground

http://static.comicvine.com/uploads/original/14/148326/4321349-6559991425-Revie.JPG

vs.

http://media.comicbook.com/uploads1/2015/04/darth-vader-rebels-season-2-132196.jpg
/

http://tastytriviaorlando.com/wp-content/uploads/2015/05/Obi-Wan.jpg

Ooooooooo! ROTJ Vader and ROTS Kenobi are an interesting team. I think Kenobi could hold off Ulic. Vader vs Kun is where things get tough.

Assuming novel version...

Kenobi can handle Kun.
Vader can handle Droma.

Not sure about the opposite.

Vader and Obi.

up

Sabers only goes Obi-Wan and Vader. Obi-Wan takes Qel-Droma, and it doesn't really matter how Kun/Vader goes (it's probably even, though).