I agree, knowing who got killed is good, and i think it would simple enough to added to the mission log.
You mean after the battle?
I want to see it during the battle.
This is useful for live translations. The audience immediately want to know who died.
I had such an experience with TFTD.
Each aquanaut was named after some of my viewers. And when they die, it is a pain to find out who that was exactly.
This is different from videos on Youtube.
There you can easily rewind.