if you guys look it up there’s pictures of them like wrestling and hanging out and just generally being good ol boys who love each other and it’s really cute
That “lizard brain” thing is the actual theory; it’s possible that the natural behaviors which would ordinarily have caused Poncho to eat the guy were damaged or removed by the bullet.
This is mostly a theory because large pet reptiles are known to attack their owners, even after years, but Poncho didn’t do anything of the sort for the 23 years he was a pet.