15/16 is the age for getting a learning permit in most states, and then maybe a few months extra for a license exam that may have some limits (usually a midnight curfew) again depending on the state. Any European license would probably be accepted, too.

Not sure how the Subaru will work as training for R5 or WRC, but it will have a lot of power if nothing else. As for competition there's Pastrana and Block who if nothing else know the roads. Dave Higgins will still be the man to beat.

Left field challenger would be Pitor Fatela in a Polish Fiesta kit car. He's done well for the last few years despite crashing his Subaru at 100 Acre Wood in 2016.

I'll find out in a few weeks.