But you get nothing from descent of angels about a possible identitiy for cypher.
Skilled gunslinger is not a hint when thrown on a marine character.
The only clear answer is that cypher was a title in the legion before heresy.
IIRC gw confessed their wrongness in cyphers armor-color in the past.
No need to be darkangelsgreen to get remembered as
DA. Deathwing=bonewhite,Ravenwing=black;
Old legion also black. Or has the
DA-chapter turned his color to cyphers?