Does somebody have to be a Good Swing Dancer to be a Great Swing DJ?
Can a non-dancer develop an ear for what makes a dancable song?
A lot of times when I'm out dancing, somebody will play a piece which would sound GREAT if I were listening to it in the car, for example, but out on the floor it's just a trainwreck. You look around the room and all the good dancers are stymied. (The beginners, ironically enough, are so focused on doing "Triple Step, Triple Step, Rock-Step" that they don't even bother listening to the music anyway, so they look pretty good by comparison...)
And you can tell the song isn't, like, meant to be a "challenge" (It's not *THAT* far out of left field) -- more like the DJ just had no clue that the song was { too jazzy, badly recorded, just kind of "blah..." }
I have to wonder sometimes, has the DJ even *TRIED* dancing to those songs??
Or is that the point? Are those the heady, cerebral songs that certain DJs feel compelled to "enlighten" us about?

(Footnote: Not to toot my own horn TOO much, but lest you think, "You need to learn to dance, bucko," I *AM* a good lead, with a ton of musicality. Ask any of the girls in DC! *Toot, toot* Hehe!!)