Well it wasn't written by Forgeworld to be used in their Age of Darkness setting.
It also has And They Shall Know No Fear, Chapter Tactics, and Combat Squads (which 30K marines do not have) and does not have Legion Astartes (which 30K marines do have), so would not really fit into any unit. Giving And They Shall Know No Fear to a 30K unit for no cost would be really unbalancing.
If someone wanted to switch those three rules for Legion Astartes and use it in Age of Darkness I would not have a problem, but that is clearly not how it works as written. Much better to just use him as some variety of character, in my reckoning.