You know what I've thought of along those lines? I wonder if Bryer held a deep resentment towards his father, even hatred? It sure seems that Bryer used him for things in recent times. AS is homeless, but bought him $100 cologne, before that it was the expensive airsoft rifle, and probably a host of other things AS hasn't publicly mentioned. I don't doubt that AS loved his son, but maybe he was also trying to buy his affection, and there's not a kid on earth that doesn't realize it when that happens. Some will even take full advantage.
Maybe Bryer was angry at him for reasons we aren't privy to? I know that sometimes kids of divorce end up realizing just who was the supportive parent, (even if they had conflicts with that parent). I'm a child of divorce, and it was in my later teen years that I learned which parent had my back, put a roof over my head and clothes on my back, and who was the "fun" parent with less rules.
All just my own random thoughts of course.