a chance for some loss in bite inhibition seems like a worthy trade for the socialization that would keep your dog being uncontrollably dog aggressive.
Amy you brought up a lot of really interesting points! I used to just let my pit bull pups play with other pups and let the chips fall where they may... I quickly figured out this was not such a great idea. Not with "authentic" pups anyway! I figured that out when my 8 week old litter of pit bulls (all 12 of them) got into it when I wasn't home and the neighbors ended up calling 911 from the outbreak of hysteria (not from the pups, they were silent) but from the wolf hybrid and other dogs carrying on because they couldn't get in on it. Was lucky not to lose one of them. As Tatonka says, it is my firm belief that you have about 2 maybe 3 "little fights" before the dog figures out that this is awesome! After that, its a paininnaass.
With Nell, I am keeping her away from any pup that even LOOKS like it may look sideways at her. The am staff in our club (15 weeks) puts its hair up and wants to jump on Nell. However, he was jumped by a big GSD a couple weeks ago, and may be suffering a little PTSD from that event
I won't let this pup mess with Nell, as Nell clearly shows that she would just rather go about her business. I've noticed that her calm, confident behavior is helping the am staff to calm down a bit. I'm not worried about Nell getting corrected by my adults - that needs to happen. And that is not "fighting", it is appropriate "language" that tells her when to settle down.
One last thing: I REALLY FEEL STRONGLY that if a dog is to be considered breeding stock, it should be able to come through puppyhood without a lot of health issues. Yes, ANY pup can come down with parvo, but I give much extra credit to those dogs that can come through without a lot of vaccinations. And, if they do get Parvo, I want them to come through with just a little fluid therapy and not extraordinary measures. Gup came down with parvo at 9 months, and came through with fluid treatments. Damien got it and missed one meal - that was it. I like that.