On a personal note, if this is truly a 16yr old (and not their parents), they have good taste in niche vehicles and how/where to research more about them. I'm impressed and you'll have a fun car culture ahead of you
In response to the question and in context, however, I think there's much analogous evidence that suggests a highly capable car is NOT appropriate for a new driver. NASCAR drivers for example don't start racing in NASCAR, same with F1, etc. You have to start small, learn the basics and one would hope - appreciate the vehicles and what they can do as you grow. In that example, people start with go-carting or other racing venues that are less dangerous, usually slower and less expensive - just common sense. I knew folks with fast or overpriced cars in highschool and it was a bad idea in most cases - usually ended in crashes and I certainly don't want me or my family being on the receiving end of a crash because a kid was given a car they couldn't handle (which is pretty much a given with a 16yr old by nature). Yes there are mature 16yr olds, academically responsible (not equivalent to driving capabilities), etc., but any children of that age have much to learn both socially and driving. I would hope kids coming from money still learn the value of the dollar - nice to see the concept of splitting the cost as a start. I like the suggestion of a 2.0 Stinger and analogous to what I saw growing up - something that's capable enables them to learn driving skills without being overly dangerous. A friend had a 944 (nonturbo), but it had a rollcage so safety was in mind and they participated in amateur racing, so they knew and appreciated the car. Others I knew learned on ford escorts and drove the heck out of them...when they got older they found higher-powered cars and were much better situated to handle them since they pushed their low-powered cars to the limit.
I'm in favor of teaching kids how to enjoy cars, whether racing, enthusiast or otherwise, however, speaking as a parent and driver whom shares the road with everyone here I find it is dangerous and potentially reckless to enable someone to drive something they aren't ready for. Maybe when they turn 18 upgrade to a GT? They'll have a couple years under their belt, hopefully a clean history of driving responsibly. Maybe do some amateur racing if that's where interest exists
Good luck in your process and happy to see interest in the stinger.
Final thought on an alternatives - if a driver's car is what people want, a subaru BRZ is well-balanced at 50/50, affordable and low powered, but have skinny tires so it's amazing fun and helps teaches you how to drive well without as much danger with a larger more powerful car (IMO). Also an Alpha Gulia (4cyl) is unique, 50/50 weight distribution but less powerful than a v6 turbo.