Anomaly in the sense that there aren't many like him, sure.
But he's been doing the whole dancing thing for years, since before he got anywhere close to this size, and he never stopped doing it. He likely had an easier time doing all that when he was smaller, but you know... You want to be good at something you'll have to actually do it (if possible).
Antoine Vaillant is another one who comes to mind with his tricking.
I guess most just don't bother with anything like that. Ronnie could do/can do splits etc...
Charles Glass was mentioned, yep, he kept doing handstands and stuff throughout his career...
Holymac learned the how to backflip AFTER getting rather big esp. by T-Nation standards.
Might just be a matter of actually doing it.
I can't see Markus Ruehl doing this sort of thing mostly because (to the best of my knowledge) he's never bothered trying in the first place, not now and not back when he was smaller.
He used to play soccer though... Got injured and that's why he ended up in the gym in the first place, I guess he stopped playing after that (not sure).
I do know several local enhanced guys who still play basketball or soccer once or twice a week together weighing anywhere from 240 to 280 or so...
Maybe not ideal, but they never stopped doing it while getting big.