Adventures: Into the Breach

This was too long for a response, but to clarify the process @Masai mentioned in his comment, here's how to cycle through Maw Missions in 9.1.5 with the ability to hop between covenants.

NOTES:
- If you assign Croman or Meatball (neutral followers) alone on a mission, it will not reset when you change covenants - do not use them in this process.
- If you don't currently have 2 Maw Missions up, you can assign one follower to each mission to reset them all - if you don't mind burning the anima.

Step 1: Assign any (non-neutral) followers to each of your Maw missions, doesn't matter if they'll succeed.
Step 2: Go to Oribos and change covenant. Immediately change back to your covenant. You will not lose anything except missions in progress.
Step 3: You'll now have two new random Maw missions and all of your followers available to use. If you did not get the mission you wanted, proceed to Step 4.
Step 4: Assign one low level (non-neutral) follower to each of the first two Maw missions you received and send them out.
Step 5: You'll immediately get two new random Maw Missions and your strongest followers should be available for assignment.
Step 6: If you did not get the mission you wanted, repeat from Step 2.

The reason for using one low level follower each on Step 4 is to assure your "A Team" of strong followers will be available if you get the mission in Step 5.

Has anyone gotten any of these outside of the top 4 to spawn? I clear missions relentlessly and I keep getting the same 4 (Ghelak/Planes/Stygia/Giants) over and over.

All my followers are at 60. I only have the 4 top of the list.