I think an outsider will win, as in someone that's not Wout or Mathieu. Providing Wout is on form, which i'm hoping he will be, they could control eachother.
Visma will probably try to play team tactics and attack with Matteo and even Tiesj to put Alpecin under pressure with Wout shadowing Mathieu. A bit like in the olympic RR in Paris last year where Wout was tasked with controlling Mathieu allowing Remco to anticipate. I personally kinda dislike races where the favorites heavily control eachother and let others ride because it doesn't allow for a duel. I hope i'm wrong and Wout just takes on the challenge and throws the kitchen sink at Mathieu.