99% of radiant materials obtained for DLC gear and weapons are obtained by doing the Crota raid. I had a thought for Bungie to have the material rewards from doing activities being a 50/50 chance of being radiant and ascendant material rewards for people who have the Dark Below DLC. Since people with the DLC are the only ones who can get DLC gear it seems like his could be feasible. Another thought was when the daily, weekly heroic, and Nightfall activities are from the DLC that it makes sense that the materials rewarded to guardians would be radiant materials. These are just one guardians thoughts for the Bungie crew and fellow guardians to think on. Thanks for your time.