Ah, that. Makes more sense. It’s not an unreasonable fear, because there is an unknown variable in the mix. They can’t prepare and take countermeasures for an unknown variable.

“Then … you’re worried about me losing what makes me human?”

Or more specifically, about Ren hurting him as a result of becoming less human. Also not unreasonable, given the unknowns. But Ren likes to think his personality won’t change just because his body does. Wings or horns or claws won’t be enough to turn his heart to unfeeling stone or smother his inner fire for justice.

“Has your humanity slipped away? I don’t see that you’re any less human than you were before.”