Regarding Laurie v James, I think they're the classic technical v performer.
Laurie has one of the best postures and footwork I've seen of any contestants, her hands and lines bother me sometimes but not as much now. She has a feel good story with her success at the Olympics and is just a lovely, bubbly girl. It's just, most of her dances are lovely and bubbly too and when they're not it's just serious face.
We had a gymnast win a few years back, Louis Smith. Situation nearly identical, had success in the London Olympics and was one of the best technical dancers we ever had. The only difference was that he was stuck on serious face for pretty much everything.
James is the performer. Technical wise he's still way behind Laurie (and I've already mentioned that I've hated the hyperbole from the judges) but give him the story of the dance and he'll be the character you need. He's got an unusual feel good story, nearly dying and all, and he's a naturally charismatic person.
What we need now is something that puts them in the opposite side of the balance and outside their comfort zones.
For James, that's easy: give him an Argentine Tango, no props, no troupe and proper music or something at least with the right beat.
For Laurie, it's more down to the music. See that Viennese Waltz? I wished they used a more somber version of Pure Imagination and, instantly, instead of Charlie she was the one of the children that failed. Val's still Willy Wonka and Laurie's character is now trying to redeem herself, much like the dance was going to be in her story arch. She's not being bubbly but she can't just be serious face.
As for Jana being overlooked, honestly, if Laurie and James weren't there, it'd probably be a straight fight between her and Calvin. Both of them a lot more central of the technical v performer scale . I would of loved to of seen Jana with Artem because she's very similar to Kara Tointon that he won Strictly with so I think he could of done a lot more with her than Gleb has done.