Hi Dave. I'm not aware of any official policy or protocol. My experience with this has been that even when working on a particular family line, I eventually get to a point where I decide not to enter that next name, or create that next profile, even though I know the name. The reason is that I have gotten so far removed from my mainstream tree that I would rather spend the available time on fleshing out my more direct ancestors. My belief is that if I enter that next name, but spend no time on it, or add no relevant data or sources, then I am just producing unnecessary clutter in the data base. Nobody is likely to come along and adopt that profile unless there is enough information in it to enable him to conclude that it's a match with a person he is interested in.
I think that's somewhat analogous to your situation, so it's a long-winded way of saying that I think if you enter such profiles of interest, you should include enough data to enable a relative to determine that it really is the person he is interested in, and you should remain the manager so you can collaborate with that relative when/if he shows up. Just my opinion, and I know there are some other correspondents in this forum who will disagree, so I'm not at all sure there would be a consensus on the question you asked.