Well, no question, I far and away preferred Jay and Aliona's to K&K's, but there was a lot of jive content in Kellie's routine and I thought she executed it well, especially the side by side part (looked in sync to me), though I felt she was flagging towards the end. The difference for me was less about technique (both good) and more about presentation and choreography, which is bound to be a more personal thing.
K and K didn't really need to tell a story, and I thought the theme and the suitcase etc got in the way, rather than added. (I liked it better in the rehearsal footage where all the extra was absent).
As for the judges, they have a small range of paddles for a large range of ability (and they don't use the full range anyway), so the numbers can be a bit of a blunt instrument at times.