Pickup collects. Vertical stack sets slightly to open side. Vertical stack waits for disc to center.
As the disc is being thrown to center: (1) sets up for a BREAKSIDE cut; (3) sets up for an open side under; (2) sets up to quickly strike deep.
(1) OR (3) gets the disc. If (1) gets the disc as planned, they look for (2) deep, OR for a dish back to center to (A), while (3) is looking to reset the front of a vertical stack.
(2) gets it deep, OR (A) gets in back in the middle with (3) re-setting a vertical, which (1) and (2) will re-join, with (P) becoming the dump.