1/2 pit 1/2 bull mastiff pups

I seen a breeding close to this before. This dogs Dad was AB and mother was Bull Mastiff. They cross him over a Mastiff and then crossed that pup over a pit. Every cross turned out to be a truly amazing dog. I think the only issue with them was the size, and a few health problems resulting from size (heart attacks, bad hips, knees and backs) but temperament wise, there were no issues... Well, now that I say that, the first pup had no dog aggression, but if a human was not invited into his house, well, it wasn't pretty. I think the weirdest thing was, it didn't matter who you were, if you knocked on the door, you were not coming in, period. That included his owner, who bottle raised him.