As above. Plus from what you say I think he can ride the Dans le Gaz black on Les Gets/Mont Chery and the longer “enduro red” round the back. I would say he can ride all Stoner’s routes from Mont Chery to Morzine and the Lac Joux Plan – Samoens route too (needs a taxi back maye not time its its just a longe w/e). I would say one of these “enduto” / off piste rides would be good to give him a flavour of non-bike park. I would not call them XC, they are more similar to what you’d get on a guided holiday
The blues is Chatel are great fun (I find red ride humble a bit of a waste of time)
EDIT: from what you say he’ll love the Les Gets 4x track (you mighf have to hold him back) and the skills area too.
See this thread STW thread
Wonderful trip by the way, good for you