I can verify a narrower swept area on the last G2 rotor purchase. It hasn't negatively affected performance on my single bike, in fact the rotor was true out of the box, hasn't warped yet, and no judder, can't say the same for the early G2. Pad wear is uniform also.
Be aware ICE non-floating rotors with aluminum carriers were designed for self-centering hydraulic systems. BB7s require a flexible rotor/spider/carrier, or floating pins, for optimum performance and even pad wear.