Now I’m wondering how frequently someone would have a coadjutor without being a member of the Transcend. I could see that being an intermediary step for an immigrant who was quite happy with living in the Empire and becoming an Imperial, but still had some reservations about the whole ‘soul-shard’ bit.
Although I suspect that occurred far more often in the early days of the Transcend, where those with a lower risk appetite might have been happy to take their time and see how their neighbours adjusted before leaping in themselves.
It’s probable that everyone relevant does, even if they don’t know it and have never had cause to ask for its advice and assistance, because the Transcend assigns such guardian angels at its discretion and it loves all its smol beans.