I'm probably not going to be much help w/this question but here's my experience: I smootly and w/absolutely no trouble or problems at all added Creamsicle, Yoda and Coco Puff to the Fur Posse. The transition was so smooth, it was dreamy. If all intros would go that way, it would be heavenly. However, when I added Pidge to the family, Peeka hated her. I swear you could see steam coming out of that cat's ears! It also started pee wars and yes, females do vertical spraying no matter what anyone tells you. She beat up Pidge and stalked her day and night and Pidge spent most of her time under my bed for years until I added Creamsicle to the family. For some reason, then all stalking, beatings and bad behavior stopped. It was as though Creamsicle was the tranquilizer. Pidge was the sweetest, most unassuming cat in the world but Peeka couldn't stand her. Maybe she was jealous b/c Boo and Pidge were sweethearts and Boo was Peeka's brother. I don't know. That's human thinking but it's all I've got. So....I think cats are like people in this one way, that sometimes they like other cats and sometimes they just don't and we can't know how it will go until we introduce them to each other. Sorry, Cindy. I know I probably just made it more difficult for you.