I see Jayne as a naturally shy/quiet person, who, despite years in the spotlight, still struggles to find something to say when the microphone is directed towards her.
And I really sympathise with that. I'm pretty sure that if I was on a stage with the cameras on me, my head would be going "la, la, la...I've got to say something, la, la,la,la......duh...!"
Hence the very safe comments Jayne gives - planned and rehearsed so that she doesn't go blank.
Chris on the other hand gives more in-depth comments when allowed to.
I've noticed that he often makes positive remarks about Beth's ability, much more so than the judges. But those remarks are left hanging because of the nature of the show.
I agree with others who suggest that T&D do appear to be just going through the motions this time around.
But as to the choreography, as has been mentioned on other threads, there is only so much they can teach the celebs owing to time and safety issues. And what they teach is further limited by what looks good on the small ice rink and on camera.
I'm wondering if, when this series ends, whether Chris in particular says a few things in interviews about DOI that his contract prevents him from saying at present.