Why new faction troops do not appear in rooms?

We have Burning Ocularen for All-Seeing Eye and Crypt Hound for Crypt Keepers. Why they do not appear in first delve rooms and final ones? At least they could replace doubling troops in first rooms.


Just FYI:
On Switch either All-Seeing Eye and Crypt Keepers have both access to the deep delves even that Switch hasn’t got the rework for them yet.