[IvJlNwum]

Sounds like you're taking a lot on. 4 dogs is already a 'pack'. Incorporating 2 more dogs into it may be more than you can handle (not saying you can't, but 6 dogs is a lot for most people). I would also check your local ordinances to make sure you're allowed to have that many animals.
I've never owned that many animals, so I'm not sure how you would necessarily introduce them to the pack and routine, but I WILL say that you need to introduce each animal individually (2 dogs at a time), because if ONE of your males doesn't like ONE of the females, and they're all in the same place, you have a 6 dog brawl that you probably won't be able to break up. Allow them to meet in a neutral place, preferably not nose to nose as that can cause a fight.
Crate-rotate is not anti-social. This breed needs PEOPLE, not other dogs. As long as each dog is allotted proper time with you, I see no problem with it. If it's possible, you may want to look into proper chain set ups if the case arrises.
Regarding abbreviations: PTS= put to sleep, DA= dog aggressive, HA= human aggressive, there are more but those are the most common, and usually linked together like "it's natural for this breed to be DA but any HA animals should be PTS".