Asleep in vs. 14 is a totally different word, than vs. 16
The asleep in 14, is a slumbering to death, or to put to sleep (involuntary).
the dead, in 16, is dead persons, in the grave, apart from the personality they once had.
sleep in Jesus, Koimao
Dead in Christ, Nekros
It is not the same thing, and it is not the same word for dead. Mat.22:31 uses this word as in vs. 16
.....He is the God of the Living.