Believe me when it comes to APBT 101, I have yet to be proven wrong.
The American Temperament Test Society (ATTS) http://www.atts.org provides testing on several canine breeds. Based upon those facts, there are several breeds that are more likely candidates for fighting at the dog park because of the temperament. Some are just as capable of killing another animal as our beloved pit bulls. Some breeds that scored well below the American Pit Bull Terrier are Chihuahua, Chow Chow, Akita, Pomeranian, Toy Fox Terrier, Doberman Pinscher and of course the Miniature Poodle. Even my Datchund and Austrailian Cattle Dog have less of a proper temperament than my pit. Another cool note... Out of 218 breeds the American Pit Bull Terrier ranks 136. We beat 62% of all other breeds in temperament and, as noted above, aggressive tendencies were bread into them. Wow... It certainly helps us question if we should protect them from our breed or our breed from them. I don't take my dogs to dog parks. They are just not safe for them no matter what the breed.
For a dog that was acquired through a "fighting ring" (as you claimed in your intro thread) might need some extra attention when in the company of other dogs, and yet your doing the exact opposite by throwing all caution to the wind......