That album is special, for sure, but Money Jungle was written (for the most part) by Ellington for that recording date; he knew Mingus was breathing down his waistcoat. Duke probably thought Fuck these flatted fifth motherfuckers, I'll show them modern!
But really he didn't have to, Monk and Powell and so many others were already reading over Duke's shoulder and slightly changing his shit up, they always knew he was ahead of his time.
Duke Ellington will always sounds like the future to me.