Now we're all friendly

information can be shared.
The one thing I do want to say though is that you said if you breed they would make great pets. The same goes for those dogs in the shelter. Don't make them have to compete with dogs you bred. On a lot of breeders websites you'll see them saying on their litters page to look to rescue, some foster, some have adopted. Let your dogs be happy pets and let the shelter dogs get adopted! Win win for everyone!
And you never know how Rebel could act after he gets bred. I've heard some dogs act completely different, some get focused only on girls and mating, some try to run away to get to girls, some distance themselves completely from people. You never know how he could change.
As far as the Am Bullies if you could find a responsible breeder somewhere, (They aren't recognized by AKC so I don't know where to look...UKC maybe) get well bred dogs, show them, health test them, and breed sure I see no problem. Same if you got a good little girl from a responsible Boxer breeder.