User blog comment:FTWinchester/Season 9 Recurring Characters/@comment-108.247.151.83-20130722011121/@comment-3045936-20130724174702

Hell even in when Dean got sent to the future, the basically human castiel, could see that Dean wasn't of their time a slight form of supernatural preception. So, I think that powered down angels can be reduce to effectively humans, either overtime or if they overuse their powers or a combation of both of these issues.