Who's to say that Hope won't be a challenge? Not all athletes are natural dancers. Remember Monica Seles? Yikes.
I think Maks has been challenged plenty: Debi Mazur, Willa Ford, Denise Richards... all borderline a-rhythmic. Tia Carrere was pretty bad too.
Of all the pros, I think Derek's had it the easiest time with partners. They weren't all "ringers," but they were all middle of the pack or better...mostly better.