Making a Cybernetic Brain Implant vs buying one

By Stneu73, in Star Wars: Edge of the Empire RPG

I looked through a lot of threads trying to find an answer to this question. If it was already answered I just must not have been thorough enough.

I have Special Mods which has rules for creating cybernetics. While looking through I noticed that the cybernetic appendages (arms and legs) each add to a characteristic and cybernetic implants only give a skill. So according to that creating a cybernetic brain implant would only give a rank in a general skill but if bought in the CRB it ups intellect. Is there any reason for that?

I feel like the answer I'm gonna get is just treat it as an appendage. Just give me your thoughts.

Anyway Thanks All!