Setting up a plan for full vet committment in the fight. There are decent enough arguments to go this path that I'd like to have a well-defined plan for it, even if it's not chosen. Also, several of the tactics listed should apply regardless of the overall strategy.
[x] Plan committment
Team 1 - Elites [5]
Mami (full kevlar)
Kyouko (full kevlar)
Kyouko clone (full kevlar)
Taya (full kevlar)
Seto (full kevlar)
Team 2A - Team Kaoru [4]
Kaoru (full kevlar) [AOE counter-aura]
Yui/Aiko/??? (full kevlar) [barriers, work together]
Team 2B - Vets [6]
Shinobu (full kevlar) [teleporter]
Akeno (full kevlar) [inertia control]
1x clairvoyant (full kevlar) [situational awareness and team coordination]
3x Strong ranged magic/offense (full kevlar)
Team 3 - Medics/etc
Second teleporter (full kevlar) (swaps with Shinobu on evac)
Healers
Detectors (ensure team stays out of miasma)
General backup
Attempt to scan for the demon from outside the miasma. If successful, use that to decide on entry point, and bring in the vet team at the same time as the elites.
If outside scan failed, the Team 1 enters first with Team 2A as support (barriers set up before entry).
Enter in an open area, not underneath buildings that would allow the demon to drop down on us.
On initial entry, Mami uses grass-ribbons in a wide area around the group as a secondary detection method while Taya scans.
Once it's detected, have Mami attach a couple of her 'undetectable' ribbons (the kind she used on Homura in Rebellion) to the demon so that it can't stealth-disappear again, as a backup for Taya's tracking.
Once Team 1 engages, Team 2B can enter. Team 2A switches over to primarily supporting 2B.
During the fight, Mami's highest priority should be limiting its mobility.
During the fight, Kyouko's primary offense is the clone, to minimize risk to her main body.
If the barrier girls go down, Shinobu teleports them out while the other teleporter teleports in, in case an additional emergency teleport is needed. Kevlar is swapped to backup barrier users before the teleporters swap again.
Every vet keeps 1 spare grief cube to deal with the aura. If the fight lasts 10 minutes (1 full grief cube each), all vets teleport out and leave the remaining fight to the elites.
If the demon's regeneration rate is evaluated as too high with the vets present, Team 2 will evacuate and leave the remaining fight to the elites.