To be completely fair, Davis and White went to him for help with their short program, because the required pattern this year was the foxtrot, which is a ballroom dance, and he said he learned as much from them as they did from him. Their free skate was choreographed by their long time coach/choreographer Marina Zoueva.
It's become more common for ice dancers and skaters to go to dance choreographers (not that it was unknown before recently either), depending on what rhythms are chosen for that year's short program and/or what choices are made by the skaters individually. Davis and White, for instance, went to a traditional Indian dancer for help with their Bollywood short program in 2010, and Davis also sought help from traditional Middle Eastern dancers to fine tune her free skate character this year. The only official coach Patrick Chan had last year was a dancer/choreographer, though, personally, I think that's maybe not the best way to go, because skaters still need someone who can evaluate their jumping technique, which is different on the ice than on the floor, and frankly, it helps to have someone the rest of the skating community knows and respects in your corner (I'm not suggesting anyone didn't respect Chan's coach or him--just that she had no history coaching skaters and thus was more of an unknown in that world).
Jeremy Abbott also consulted with a tango expert a couple of years ago for his short program, and I believe Corky has worked with skaters as well.