I see no harm in answering your questions, since they probably won’t be directly answered any time soon.
To make it clear, Rias’ peerage, save for Rias herself and now probably Issei, doesn’t have a negative opinion of Fatel. They met him before, but they don’t think anything too badly of him. Could change sometime in the future and with their loyalty to Rias, who hates Fatel with a passion, they could very well be influenced by her hate for her brother and start thinking negatively of him as well.
For Kiba and Koneko, the reason they didn’t intervene in Rias’ attack on the church is because they still trust her too much. They expected her to know what she was doing. Keep in mind that Kiba and Koneko still consider Rias their savior and would follow her wherever she would lead them. That is something that could perhaps change as the story goes on though.
Asia doesn’t know Fatel in the slightest, since he didn’t have anything to do with what happened to her and they haven’t met before. Asia will stay like canon Asia for now but that could also perhaps change. I don’t know that myself.
Thank you for your questions. I hope you will continue to read and enjoy my story/stories as I continue.