Okay- you do have a confused dominance problem- who is boss and where in the rank they fit. You can get a behaviorist or trainer there to work with the dogs.
I see a mixed household- meaning the ones that were boss in each others house, then simpli-ized on the last newcomer. Being a complicated household I would get a local trainer or behaviorist. I thought these dogs had been seperated at one time, and was hoping it was only the dogs that were together in one home after a second group- but that is not the case- ..