Ah, but the beauty of wikitree is its synergy. I've really been energized working collaboratively with distant cousins, and it's thrilling when your see your tree get fuller when that collaboration works as wiki was designed to. I'd suggest continuing as you are, and starting a duplicate profile only when you have to. I'm not the most patient of people, but perhaps you could send an e-mail to the person letting them know that you're going to send a slew of requests (maybe suggesting that they could use the Bulk Trusted List Changes tool, selecting to add all ancestors and siblings of "Closest-123") - and then click through as you can, asking to be added. And then, the hard part... giving it a few days. Good luck!