This is the only position he as any business playing at this stage of his career as long with the 10, in the 4-2-3-1.
It minimizes his negatives which is walking around of the pitch in this formation we have only 1 player doing that instead of two and brings all his best work to the fore.
He can turn it on for a game or two but at a World Cup there's always a game 3 days later and he ends up knackered after a long season with no rest.
You'll see him pace himself through the tournament. Ideally he could do a Ronaldo and just goal hang but like with Barca he has to create as well as score their goals.
He said he prefers to play every 3 days, and there is no way he gets phisically exhausted looking at his work ethic, probably won't play longer than 30min anyway.