Kooij speed is sick, there is a video of an early trainingcamp this season when he give Dekker a run for his money in a sprint between the two of them and I think David was going quite fast. Last year Olav also made Bauhaus looks very slow in Settimana, but the stage was 100 kms long only. I believe that in traning he can be the fastest Jumbo (behind Groenewegen) even with Van Aert there. But he doesnt seem to have the engine ready to put the same display of power afetr 200 km with the WT riders and in hard or windy conditions, the Slovenian and CRO races are much easier for a very young talent, Coppi Bartali Stage also.
In the other hand Dekker seems more explosive and fast than I initially thought, and he has a big engine and is a perfect rider for windy conditions and for high speed racing of one day races in Belgium. He was in great condition in UAE and he has been training at altitude in Tenerife recently. Maybe considering all the factors he should be the initial leader, at least.