Invite Glut with main character.
Have Glut raise something.
Dismiss Glut.
Invite Glut with a companion character(first companion).
Send first companion character to camp.
Fast travel to waypoint outside of Underdark with main character only.
Fast travel to camp with main character only.
Use a second companion to dismiss Glut.
Enter conversation with Glut using a second companion.
Switch to main character in camp without leaving conversation.
Invite first companion back into party.
Use Leave Camp from waypoint/map menu.
Switch to second companion character conversation and select Leave.
Fast travel to surface waypoint with companions remaining in Underdark.

To give a spore raised creature its own full size portrait, have it enter combat by itself, then use a door with the character it is attached to. If Gekh Coal has his own full portrait, every creature he raises will get a half portrait, going to camp will recharge his spell slots and also turn raised corpses back to their original form.

Combat with really big parties will eventually cause a soft lock with infinite repeated initiative checks.