Not a pitbull guru, but never heard that about the jeep dog.
Cause its not true. Jeeps dad was a cur, but not a blackmouth cur, a pure bulldog that quit in a match. HUGE difference!!! Also like I said before the main reason the Blue pits get up to 80-100lbs not always but usually cause it had Neapolitan Mastiff added to them a decade or two back, color a lot of time too. I been in bulldogs all my life and I will tell you a true gamebred bull dog that is 100 lbs is one in a million. Happens once in a great great while. The size and color come from breeds outside the gamebred bulldog. It is what it is, its not a slight on them just different type of dogs.