I respectfully disagree on two grounds.
1) Hummer and Saab are more differentiated from that block. By your argument, those brands should remain. 2) Being different is not necessarily good. Pontiac is selling far fewer cars than the Chevy brand. Apparently different doesn't bring in the bucks.Actually, what may work would be to sell the G8 and Solstice in Chevy dealers. That will bring in people to look at the cars and perhaps buy those cars or other Chevies. that one big reason why Ford and Chevy and the Mustang and Corvette. I doubt either are big profit centers.
Jeff