User blog comment:Khalael/Canon Policy Discussion 1: Space Marines/@comment-2253300-20131103062707/@comment-3341288-20131103173133

Loyalist Traitor chapters, yeah no, it would never work realistically. But nothing wrong with a Heresy-era Loyalist. As long as they die during the Heresy, after it, or are MIA.

Like my Dedaran Voldur character, he dies and the rest of his company's fate is unknown. Nothing wrong with that? In no way infringes on canon as long as their reasons are reasonable. Being Terran or something.