User blog comment:ImperiexSeed/Supernatural Mysteries/@comment-1509826-20120310175518/@comment-3481504-20120310180539

Yep, that makes no sense whatsoever, unless what Ruby meant, was no demon can has the effect of Cas' resurrection, e.g. shaking the ground, etc.

I mean, Sam's interaction with a Crossroad demon means it could've resurrected Dean, but chose not to, so that the First Seal could break.

Huh, guess he could've done that, but mustn't a ritual be done before for her death to work, as shown in "Lucifer Rising". All demons are capable of touching iron, though most choose not to due due to the pain.

About age providing power, that's not always the case, as the Leviathans are probably older than Archangels, but are no where near as powerful