Darths And Droids 2: Should've Gone to Naboo

[Traab]

The prosthetics visible on Vader in RotJ weren't necessarily the same ones he was fitted with at the end of RotS. There's quite a few EU stories where Vader gets into a tough spot and needs some replacement parts afterward...

Also, just because he had the prosthetics doesnt mean he needed them. Wasnt the emperor intentionally weakening anakin when he put him in that suit? With all the injuries he had, how would anakin even notice an unneeded addition or two to keep him in pain and weaker than he had to be.