then how come wva placed in top 10 after being so so far back
Because WVA is quite good at freelancing?
Jumbo ran a train into the final couple of KM that was disintegrating with 2k to go. It's not riding for WVA it's very obviously keeping JV out of harms way (which was perhaps a good call given the chaos we saw). There's very few teams ever who can bring a stage in from 4k out but that's when Jumbo were hitting the front en masse.
Even at like at 6k out it's Benoot and Vingegaard at the front of the field, before the others then push up with nobody looking to carry WVA up in their wheels. A little while later you see Vingegaard gesturing Benoot up to push things on despite WVA not being there.
It's not a problem, Jumbo aren't a sprint train and maybe WVA is best off trying to surf on others wheels, but Jumbo were definitely not riding for him today.