Right - connected profiles. Got it. I'll do as you suggest - add comments and profiles connected to other profiles already on Wikitree.
Thank you to all three of you for your helpful advice.
Your answers made me think of another question - the reason I want to add someone unrelated to anyone I've seen on Wikitree is that I think he may have relatives there, but at this point I can't prove that he does, so I thought that by building out his family, a connection may ultimately be provable. So the question is, once I've made 50 contributions, is it then possible to add a profile for an unconnected person, that is someone with no known relatives on Wikitree? I'm guessing that that is possible through the "Add Person" option, but just checking.
Ann