User blog comment:Epakrios/Plot holes/@comment-1509826-20140118183926/@comment-5619706-20140119052526

Technically, when Gadreel possessed Sam this season, they still used the bright light instead of the grace-like wisp, so I still think they just made a mistake in the following episodes.

Personally, I preferred the earlier renditions because it highlighted the difference between angels and demons, unlike the usual representation that one is just a lighter/darker version of the other. Angels being creatures of expansive light and radiance as opposed to the suffocating dark smoke of demons really upped their contrary characteristics. But of course, it is apparent that Gadreel returning to his unnamed vessel (Tahmoh) is now what the show wants us to believe how it's always been or that it's because of the angels falling. At this point, it's getting hard for me to even talk about lore, because you don't even know anymore if citing previously established lore is still relevant and proper or is now futile because of the several changes in the lore.