That's the other thing about different technologies - in Fives' galaxy prosthetics are so common and accessible you rarely see someone without one unless it's not been fitted yet. But he's seen enough injury not to mention it.

He taps his head, just behind the tattoo of the aurebesh numeral 5 that represents his name.

"Makes me wish info could be downloaded from there as easy as they uploaded stuff in our training."

It's his way of sharing a vague similarity - although of course he hasn't been brainwashed. (Of course he hasn't been.)