Wow...I couldn't disagree more.
Andy Blankenbuehler is by no means an obvious choice. First, he needs a greater body of work before he can be said to be re-defining anything. Second, "The Apple Tree" and "9 to 5" were pretty awful. Third, while "In The Heights" is wonderful, so much of it is cribbed from existing street and/or latin choreographers and dancers who do it even better. Had he expanded more significantly on their work, I could give him more credit, but lifting so much of it wholesale and plopping it onto a Broadway stage does not make him a revolutionary.
As for Ashford, Marshall and Mitchell:
-- yes, they have some stylistic tendencies that often make their work recognizable, but it's rarely, if ever, anything unique or special or different or groundbreaking.
-- it shouldn't take "any real dancer" to recognize the difference, if the style is sufficiently special. The fact that even to an avid theatregoer, Ashford often looks like Marshall (not so surprising since he assisted her) which often looks like Mitchell, says something about how homogenized Broadway dance has become.
"No matter how much you want the part, never let 'em see you sweat." -- Old Dry Idea commercial