At a weight of 78kg (though he is probably lighter than this) Wout Van Aert got 3rd fastest time, around 6.4w/kg. At 78kg, that is around 500w for the climb.
Dumoulin at 69kg, would have needed around 420w or so on his TT bike with higher weight, but more aero position. 6.1w/kg.
Ritchie Porte at 62kg, would have needed around 420w for his time, about 6.77w/kg.
At a weight of 78kg (though he is probably lighter than this) Wout Van Aert got 3rd fastest time, around 6.4w/kg. At 78kg, that is around 500w for the climb.
Dumoulin at 69kg, would have needed around 420w or so on his TT bike with higher weight, but more aero position. 6.1w/kg.
Ritchie Porte at 62kg, would have needed around 420w for his time, about 6.77w/kg.