When Lucifer asks if Jack is like him, the answer kind of is yes. It's just that he's like Lucifer was before he got jealous and angry and rebelled. Lucifer was described as the brightest, most beautiful angel in Heaven, and Jack is the brightest ball of sunshine I've ever seen. Also, compare this scene to the scene in s5 when Lucifer and Castiel first meet. So much has changed since then, Lucifer no longer has that intimidating presence, and Castiel's words and expressions are from annoyance and hatred, not fear.
God has a sister,alternate universe with alternate version of people and also supernatural beings,alternate Michael is evil which scares the hell out of this universe's Lucifer and took his grace,just three episodes earlier the cosmic being told Cas that every dead angel is having a nap for eternity in the empty which can wake by Jack's power and an angel in this episode says they're going to be extinct!Supernatural really knows how to challenge the stories of our lives! but I don't believe for a second that Jack doesn't have the power to heal the angel's wings or bring back some of them to life!why the writers aren't considering that?
When sad or tired of people, I come to RU-vid to remember my favorite SPN character, Castiel. Then to really put a smile on my face, I watch after M3:38 to see both their faces, PRICELESS!