Well all the ones i've seen that say they are alligator are not very big..def not over 100lbs Maybe someone has been mixing those too..who knows..a lot of so-called "Pit Bull" breeders will do anything for a buck and if it takes mixing in a beast to make some money, they WILL do it!
There is no such thing as a PUREBRED heavyweight APBT...there are mixes with Cane Corsos and Presa Canarios (and other big dogs) that make them big... The Purebred American Pit Bull Terrier alone can not get to over 100lbs..(unless it is obese of course) it has to have SOMETHING mixed in to get that bigger size