Azazel sent her to Kuoh because he was worry Issei might go into a rampage, Azazel literarily said that the reason he sent her to Kuoh is because he was worry Issei would have gotten into the rampage. He stated this at the Light Novel and the Magna, the anime didn't mention that part. Issei would have gotten unstable if he didn't turn into a Devil proof of yet again, by the Peace meeting Arc. Raynare killing Issei because of her plans is just speculations with no proof of evidence, her killing Issei because of orders was.



From both Light Novel and Anime, when she was about to pick up Asia, she said to Issei when he reveal his Sacred Gear, she said that her superiors sent her there because Issei has a Sacred Gear that could be dangerous. In the magna version she said that she was order to kill Issei. I never said it was Azazel, most likely it was Kokabiel that gave her the order. Since he has motive of wanting to start a conflict with the Devils, probably use Raynare group death as a martyr, but again that's speculation in my part since it could have been anyone else that gave Raynare the order.



True that Fallen Angels don't kill Sacred Gear user anymore, but Grigori are not the kind organization that always follow the rules. They allow known murders, such as Freed and Valper into there ranks. Not to mention Azazel didn't have any attention of recruiting Issei to the Grigori he was worry that he might go into a rampage. While it's true that Azazel is a Sacred Gear nut, but he was gathering Sacred Gear users because that bitch Ophis started the Chaos Brigrade.



For Twilight Healing, Raynare want that Sacred Gear because she want to be loved and proof to the people that were bullying her were wrong. That so the Fallen Angels would have a Sacred Gear that can heal there wounds. As for the reason for Asia, Sacred Gear user are basically walking targets for the Supernatural mostly by Devils, she saw an opportunity and take it. There also the fact Asia wasn't immortal and doesn't know how to fight.