If you think about it, Obi-Wan and Yoda also gave themselves over to the Force in a similar fashion, especially since Obi-Wan disappeared an the moment before Vader’s saber hit him.
Did he? I always thought Vader killed him.
His robe is empty before Vader’s blade hits, but it could just as easily have been the limited special effects of 1977.
if that wasn’t the intention lucas would’ve changed it for one of the SEs.