Dage uses Frostbite, Frostbite is DICE's property, DICE is EA's property.That wouldnt happen.
Could exist in the same universe? Like.....I dunno, I've played both the first games of each series, and I feel like they could fit in neatly, I still feel like they have pretty close in game systems too. Not to mention I swear they used the same graphics engine,I dunno, it'd be cool, thats just me.
Geralt would wipe the floor with the Inquisitor.