There's a long answer to all of this, and I think there is an "identity crisis" that we don't need to get into here.
The GT/CS was ONLY a MARKETING plan to sell Mustangs. Not an ENGINE plan, nor was it a SHELBY plan. It was a quick corporate decision at Ford to sell Mustangs by getting people's attention. It represented the thinking at that time, and in doing this car, they really didn't care about how it would fit into the scheme of things with the Shelby lineage, nor did they care.
I think there is a false concern that we need to somehow know where this "missing link" belongs between Mustang and Shelby. That's something I will clarify in the book.
However..I suggest that we focus on the simple fact that this car IS what it IS. We don't need to feel any kind of akwardness about our cars if some (unaware) person challenges you on whether is is a Shelby or not. That, frankly, is their problem, not yours to explain or justify.
Let's start right now thinking about how we have this unique Mustang, and set a standard of it being what it is. It's a limited edition Mustang made in California, with Shelby parts. Let's be proud of that heritage. Let's make that mark in the Mustang world, and be proud of it. Know what it is--and isn't. If you don't want to think that it's a Shelby Automotive product, then think of it as the best Mustang coupe ever made!
There is no need for an identity crisis here. Be greatful for having a very rare Mustang that gets more attention at car shows--and in public than most others.
Paul N.