[Never by virtue of having nothing to grieve or never by not having the time, capacity or energy to do so - Akechi can't be certain.

Grief is pointless, but impossible to escape. It consumes and constricts until nothing's left.]

If you have the capacity to care, you have the ability to grieve. They go hand in hand. Monster or not, human or not - even animals and insects has been shown to feel distress at the loss of one of their own.