I think that (largely due to injury) this is a big part of how V&M have failed to keep up- they have been unable to improve the things about their skating that were already excellent, whereas D&W have been improving everything, bit by bit, to come to where they are not.
I'm sure a lot of that has to do with V/M constantly having to manage Tessa's injury, training has to be paced accordingly etc.
You are not sure? V/M don't train hard coz of Tessa's legs. However, Charlie's asthma doesn't affect their training, and they train even harder. As a result, V/M don't deserve to win. What a bunch of made-up crap.