The "box" indicators are for live conscious units:
1. live directly visible aliens (red)
2. live indirectly visible aliens (green)
3. live wounded friends (blue) -- this is the only unfortunate exception... shows also unconscious units... probably a bad idea
4. live almost stunned friends (purple)
The "floor/corpse" indicators are for live unconscious units:
5. unconscious, on fire (flame)
6. unconscious, not on fire, wounded (blood)
7. unconscious, not on fire, not wounded (zzz)
If there is a need to create a new indicator for a live unconscious unit, which is not on fire, not wounded, but still somehow taking damage... I think it belongs between points 6 and 7 as a new type of "floor/corpse" indicator.
PS: having a "box" indicator for an unconscious unit is very confusing... every video I've seen, where the blue indicator pointed to unconscious unit, the players were totally confused and looked around cluelessly like blind rats... I don't want to make more of those