you know I was just looking this up the other day for someone and didnt come up with much luck.
Now I was told the gotti/greyline are the same thing except gotti line is only refered to direct descendant of the notorious juan gotti.
From the dogs I saw when I search greyline they were all opverdone way bullyish. Some looked so far from the apbt it was disgusting. sites were waaay outdated
Greyline was two brothers with different Kennels.....one was actually the greyline kennel the other had some name and diff bloodline but they were the same dogs.
The last name was moore I believe, two black dudes, I think one was military or something.
google greyline kennels