As of today, the official maintainer for both Sigil and FlightCrew is John Schember (“user_none” on MobileRead). He’s a very bright and competent guy. He’s got what it takes, trust me. As a community, please give him the same consideration and respect you gave me. It will take him many weeks (if not a few months) to get fully up to speed with the codebase, so patience and a warm welcome from the community will make sure things go smoothly.
To those that are still on the fence on whether to contribute to Sigil’s development or not, get off that fence and help out John. :)