Well, I'd run on the edge and say that if the one-77 is in, we can assumeall the Astons sold today except for the V8 Vantage would be in, except that would be a bad assumption. We can make the assumption, simply because their most exclusive vehicle has been added, so the rest should be no problem. But it's a wrong way of thinking, that's really what D's point was.
I see your point as well, but it's never just ONE factor either.
Factor 1: All the money went to gain the rights of the one-77, since Aston Martin raised licensing fees with the inclusion of this car. Eden may not have been able to afford it all, so they cut what they felt might not be useful in the game.
Factor 2: If the Aston Martin contract was made, the Rapide may not even be included in it, it only JUST became a Production vehicle. Thus, it may not be in the contract at all. This could be for company laws or whatever, or Atari got to them first. Who knows. Ditto for the V12 Vantage if Aston Martin didn't give them the (originally) Euro-only vehicle.
Factor 3: Duplicity is another reason some cars may not be seen. Mercedes-Benz is NOTORIOUS for having cars that over lap. CLS and E class for instance. The CLS may be put in because it's sportier than the E class, so developers and the company decided to cut the E class. Another example would be the DBS and DB9. They are very similar, and for Atari, it may have been a better alternative to just have the DBS this time instead of both.
Factor 3 is the least likely to happen in a game like this, unless it's coupe/convert debates, and even then, doubt it. But it's still possible to happen, so they could make room for other vehicles.
So, we can assume they'll be in, but we could be entirely wrong as well. That's all it really comes down to.
The problem is we're arguing Aston Martin here, it is a company that it's pretty possible for all the cars to come in (except the Cygnet) as they are all part of the life style. We can't guarantee all the cars, but they're all possible.
Switch the argument to Mercedes-Benz and it makes much more sense to argue it. The GL, R and GLK may not be in because they don't fit the image as well as the ML and G do. S might be in because it does fit the image, but it may not be sporty enough, but the SL and CLS are..etc..