Didn't read all the post so I could just be repeating stuff.

All bully breeds are STUBBORN! You have to let them know on a regular basis who is in charge. If you don't, they will walk all over you. You have to be firm with them. As far as pooping and peeing goes. This works on all dogs. Feed them by the back door, as soon as they are done eating let them out. Do NOT let them back in until they do both 1 and 2! If they come back without doing one or the other, tell them to "go out."( or what ever command you want to give.)
All bullies like to chew, especially puppies! Make sure that they have stuff to chew on. Kong makes some of the best toys IMO. Cow hooves are also very very good. Exercising is easy. You can walk them for 20-30 min a day. You can throw a ball, stick or Frisbee. Another great exercise for any dog is a Flirt or spring pole. There are many videos on youtube showing how to make and use them.