Well, I suppose I had also forgotten to address something similar - the overlap between the potential events for the Super Formula racers and the Super GT cars within Gr.2. I would certainly hope Twin Ring Motegi does return, either at launch or as DLC, as with it, most of the Super Formula/Super GT courses would be available, between Fuji, Suzuka, and Autopolis also being present.
So I don’t really know how I’d potentially differentiate the two. Maybe for the Super GT championship, if DTM racers are added, it could become a broader DTM/Super GT500 championship, including some DTM venues like Brands Hatch, Spa-Francorchamps, Nurburgring GP, Monza, and the Red Bull Ring. (Especially since it seems like the real-world Super GT500/DTM combination only lasted for one non-championship race.)