I believe that these variations account for the varying effectiveness of different therapies with different individuals.
Some approaches seem to be more effective with some individuals than others.
I have developed my guidelines for assessing any interventions for Graham, I offer it here as a personal opinion, in the hopes that it may help other families trying to make choices in this area. Costly interventions should be scrutinized closely. I look for interventions that have helped people similar to Graham. I'm personally skeptical of anyone who claims 'cures' as opposed to improvement. There is no 'single answer' for all people.