You both look clueless in this discussion. Generating a high wattage doesn’t mean you have an incredible weight/wattage ratio at all, feck sake. The highest wattages are put up by the likes of Boonen and other pure sprinters in bunch sprints for a very short time, which is something Van Aert indeed excels at. He doesn’t have an ideal weight/wattage ratio to be a climber though, and he won’t sacrifice his power to lose weight. Climbing is generating the highest wattages possible which are sustainable for a long period of time (currently at just above 6 Watt/kg in the mountaine, while riders go up to 1500 Watt during bunch sprints).
But by all means, believe that he could be a GC contender in the future. I’ll be here after his career, pointing out that he’s never ended in the top 10 or 20 in a grand tour.
If you don’t believe me, try to translate some of the works of Paul van den Bosch and Peter Hespel, and you’ll maybe understand what kind of role wattages, weight and VO2 Max play for a cyclist.