I wonder what they constitute as "playing" as well?
I would always go in and look at the cards, and sold a few doubles that I had. Placed some players at some positons, and played a game or two for the trophies. But I never touched it again after that.
Whereas RTTS I played consistently every day for months, and occasionally dabbled in Franchise.
Technically I played all 3 modes, but I wasn't actually playing DD.