So I had this silly idea of Rowan returning to New York to exact revenge on the Ghostbusters…except that he’d be reduced to a much smaller and weaker form. Patty basically adopts him by begging the girls to not put him in captivity like with the other ghosts. Shenanigans ensue from there! He wouldn’t even be a teammate or a pet….just mostly a test subject for Holtzmann’s experiments haha.