I thought of that whilst I posted it.
I was referring to a "mirror match" or a fight between people with exactly the same skills and weapons etc.
Both ends of the spectrum ARE mirror matches as I've presented them.
Offensive guy A has a peak Guns score, some Stunts related wholly to attacking, a rocket launcher, no defensive skills that work against a rocket launcher, and no applicable Powers. Offensive guy B has the exact same stats. This is a mirror match, so you can run them off the same character sheet with the exception of tracking expendable resources.
Defensive guy A has a peak Athletics score; Speed, Toughness, and Recovery Powers; and no offensive ability to speak of (be it skill or weapons). Defensive guy B is again exactly the same. Again, you can run it off of the same character sheet except for expendable resources.
Both are mirror matches, because both fights are someone against their clone, with the same equipment. Just being a mirror match doesn't make the mirrored character well balanced, though. And my point was that where they sit on the offensive-defensive spectrum has a lot of influence on how long the fight lasts.
Purely offensive characters, for example, will run each other out of stress really quickly, as quickly as the system handles such things in fact. I mean, you can get higher than weapon:5-ish, but the other guy isn't rolling his +0 defensive skill against your +5 offensive skill in the other configurations.