There's no way Benoit killed him. The reason he went home Saturday could be because his crazy wife, and she was nuts, killed their son and he proceeded to kill her in return. I do know for sure though that he did not kill his son, he would never do it.
Yeah ther is definatly a lot more to this story than the public knows, hopefully info will come out soon.
I do think you are right though, I don't see anyway him killing his child, I don't know anything about his wife but you say she is crazy so that may be our answer.