I would agree. Unfortunately, there does not seem to be any data on this.
I posed the question because of all the posts on resale value. Will one model have greater depreciation than another because of supply?
I don't have an answer. I got a Touring because I agree that it is the 'sweet spot'. But my guess is that the Touring wasn't, isn't and won't ever be the best selling trim. The GT was and may still be the best selling option. But if not, the Pure probably is now.