I agree with all the above. This week's show was flat without them, although having Katya as lead in the superb Chicago dance made up for it somewhat.
Some of my favourite SCD dances are Ed and Katya's. I loved their Laurel and Hardy quickstep, the Halloween mad professor cha cha and of course the Gangnam style salsa.
They've made the series for me.
It will be interesting to see who Katya gets next year. I hope she gets someone who tries their best and she has good rapport with, like she did with Ed. I'd love her to win.