If the pit gets to stay, I would not go back. A friend's dog recently attacked Molly. They have been friends for about 6 months. I did some reading on dog attacks and I read if the dogs get together again, they will probably want to continue the attack.
Like your dog, Molly did not bite the dog attacking her. I'm curious if this is a GSD thing, fierce barking and mouthing but not biting? I hope your dog is not affected by this and keeps his goofy personality.