Roxanne was amazing but Yuna and David are so tight I don't see her leaving him and getting someone else to choreograph her programs. Yuna, Brian, and David are a dream team!
I think David would be open to collaborating w/another choreographer; didn't he and Tom work together for Lark Ascending? Because I remember this one clip where he's talking about the making of Lark but on Yu-na's page, it's credits Tom But I believe that David even said he'd be okay w/it :3 Besides, here's the bright side; it'd expose David to other artistic approaches and could help him as a choreographer as well. Artists don't thrive off of isolation; they grow when exposed to new and different styles and keep themselves open-minded ;D
And besides... Tom Dickson's choreograph for footwork is GORGEOUS See here: http://www.youtube.com/watch?v=L0LvJxsA88A
Absolutely lovely :3