User blog comment:KillRoy231/SPOILER's return/@comment-70.93.83.195-20181130074926/@comment-70.93.83.195-20181130194551

But even than Dean was only able to kill Lucifer by catching him off-guard and stabbing him with an archangel blade, whereas even with Michael's power, they were at least evenly matched. This mean despite being super-charged with his son's powers, Lucifer's vessel can still be cut with the blade, so extracting Jack's grace by that means would be doable.