MK is easy to figure out really. The M&G take time to schedule. They won't release those until they are certain they have the talent lined up. It's more complicated than just scheduling bodies to work the rides. Laugh Floor sort of fits the same way as it's more than a ride, there is SOME level of talent/knowledge needed to work the system there, though how much/how hard I haven't any idea.
AK is less easy to understand. Honestly could be as simple as someone forgot to click a button to include the rides.