From the workshop menu, I was able to select him and assign him just like any other settler, and assigned him to my level 3 restaurant. Once he arrived he walked all the way to the middle of the town with everyone else and sat down in a chair. I followed him all the way there and made sure he arrived.

I then recruited him again and he turned and walked to Sanctuary. Then I enabled him with the console commands 'prid 00192357 enable', and he appeared in the cabin and he started walking (although he started walking south, away from Sanctuary). So, I decided to follow the suggestion on the Fallout 4 Wiki here,, and went back to the site where I recruited him, and there was another random event there. Then eventually my settler count dropped back down 1 to 18. I waited days (both sleeping and actual gameplay time) and he never showed up. But he never started walking to Sanctuary. Immediately, my settler count at Sanctuary went form 18 to 19. So, he presented me the conversation dialog option to recruit him, so I recruited him to Sanctuary. I have lots of connected population all over the map and a level 3 Restaurant in Sanctuary, and room there (18 settlers, Charisma of 10).

I met him in his random event 'Time to Party' in the cabin directly south of the Drumlin Diner. For example, I had a problem with Ron Staples (who is supposed to be able to be a level 4 Restaurant shopkeeper).

Fallout 4 level cap mod