User blog comment:A.J AL/Season six plot hole./@comment-5619706-20121215033415/@comment-3481504-20121216235615

Well, as stated by both Castiel and a Leprechaun, a soul is basically a "ball" of energy--a source of emanate energy. Or, as seeing Death said it's not a "rubber ball", it's more of disproportion, lanky energy. So, seeing as Castiel can absorb Hell's souls, it shouldn't be any different for Heaven's soul, unless God mandated a law preventing so. You're right, Castiel's always been the "good little Angel" type, so he would've saw doing that as blasphemous.