И до ереси они тоже были темно-зелеными. Цвет выбрал Лев, когда легион нашел его на Калибане (было упоминание в книжке "Сошествие ангелов"). М.б. это конечно боец "Крыла ворона", но тогда неясно где байк, и почему доспех не полностью черный. В общем, с какой стороны не глянь - автор тупо попутал символику ДА и Храмовников.
http://wh40k.lexicanum.com/wiki/Dark_Angels#.U5QRz3J_uSp
Horus Heresy Aftermath
Caliban was destroyed during the Betrayal, shattered by the warp rift and orbital bombardment. The remains now form a sizeable asteroid field. The largest piece, which survived due to the massive void shields in operation around the largest fortress-monastery, called the Tower of Angels, was hollowed out and became a gigantic spaceship/monastery which is now the home of the Dark Angels. This ship is known simply as The Rock. Sometime after the Betrayal, the Dark Angels changed their primary heraldry colour from black to dark green.
Horus Heresy Aftermath
Caliban was destroyed during the Betrayal, shattered by the warp rift and orbital bombardment. The remains now form a sizeable asteroid field. The largest piece, which survived due to the massive void shields in operation around the largest fortress-monastery, called the Tower of Angels, was hollowed out and became a gigantic spaceship/monastery which is now the home of the Dark Angels. This ship is known simply as The Rock. Sometime after the Betrayal, the Dark Angels changed their primary heraldry colour from black to dark green.