Animation Priority Mix Up. What are the Priorities?

Hello there, I am making some animations for some NPC's and so far they all work, except the idle ones.

So far I understand that Action is the one with the highest priority, and Core is the lowest. I have an Idle 1 Animation and an Idle 2 animation. The Idle 1 plays when the NPC is stationary and the Idle 2 plays during the Idle 1, much like the hand swing your character does when idle. The problem is, I do not know what the priorities are for the animations and when I set the Idle 1 animations to Core or Idle the second one never plays unless the NPC walks around and stops.

In short, what should be the priority values for the first and second animation?