I think the only other upsides mentioned in the article is that he has stopped eating his clothing, that he focuses on eating real food now, and that he washed his own dish after eating.
Basically, it would appear that the upside is that his lessened aggressive behavior is allowing him to engage in more constructive behavior.
But you are right. We have to wonder if the marijuana usage is doing more for the child or more for the parents.
Unless it's harming the child, which, apparently it's not, I see no reason to stop the treatment if it's doing the child any good whatsoever, no matter how big the good it's doing the parents.
Basically, it would appear that the upside is that his lessened aggressive behavior is allowing him to engage in more constructive behavior.
But you are right. We have to wonder if the marijuana usage is doing more for the child or more for the parents.