Hey @wise_kserkso
I believe it should be these operators on each side. If it hasn't unlocked yet, I can only suggest going through them again in case you missed one or it hasn't counted for some reason.
Attackers:
ASH
THERMITE
MONTAGNE
TWITCH
BLITZ
IQ
SLEDGE
THATCHER
FUZE
GLAZ
Defenders:
CASTLE
PULSE
ROOK
...