User blog comment:Thetwindler/Massive Supernatural Plothole/@comment-3169324-20180509223229/@comment-3169324-20180510070123

And you know that how? Sure, even one soul was able to power up a weakened Seraphim to the point he could time travel, but archangels are much more powerful. Hell, four archangels were more powerful than every angel in Heaven (back in season 11). The difference might not be worth the risk.