As I said, the two lower (towards the center of the rotor) "pins" do not move; they are held in place by small roll pins inserted from the bottom side of the caliper. Their purpose is to hold the bottoms of the pads so they do not try to rotate inside the caliper under braking. When the small roll pin comes out, this is what happens:
And this is the roll pin that retains them:
So in normal use, they do not move.