User blog comment:A.J AL/Supernatural Fights!/@comment-4632123-20141209005821/@comment-5619706-20141210043600

I beg to differ, Eve could use souls to boost herself, and those number of souls she held sway over were enough to elevate a Seraph (who, despite being boosted with 10,000 souls and the weapons of heaven was still weaker than her) into God-like status.

While she may not be capable of completely killing Dick, I doubt she would easily succumb to the Leviathan. Additionally, if the Leviathan could copy magical abilities, then they should all have had angelic powers since they were all contained by Castiel at one point. But that wasn't the case, so it stands to reason they could only copy physical abilities.