Remco being a top football prospect until 15-16 yo makes it harder to judge if there is a lot of untapped physical potential left. He probably has trained and lived at a more serious level from a younger age then many of his peers. Just look at his incredible junior levels where he was superior to Vinge and probably even Pog.
Bike handling and descending are much more clearly in need of improvement, not only is he slower, he probably spends even more energy to catch up and dont forget the stress factors of having to take more risk then you are confortable with.... I feel we are taling minutes here over 3 weeks, not just seconds.
His body is the least suited of the big three for GT riding / climbing, just having this more developped upper torso really doenst help in climbing. This I thinks requires him to be the most dependent on ideal prep for a GT. I also think that it will be easier for Pog and Vinge to have a long GT career, because its more their natural habitat. So for outlasting those two.....
His burning ambition will help, he has shown that he can really dig deep to achieve top goals.
I feel he would also benefit most of the big three of the best climbing train. Being able to set the perfect pace would suit him and limit loss time on steep mountain finishes...
And hopefully for him, some serious tt miles would not hurt.