Benny has been so good with Ringo, and they have even played a few times together already. It's hesitant, but no hissing or aggressive behavior. I managed to get one blurry shot of them playing on the cat tree. Ringo is fascinated by his "big brother" and follows him everywhere. Benny has been so patient with him.
Sadie has not wanted to interact with Ringo yet. She's made a bit of progress in the past couple of days, but generally stays away from him. I've been praising her, giving treats, and letting her retreat as needed. I think in time she will adjust.